Version 3.3.1 (March 25, 2003)
getdate: Add Heliocentric Julian Date and Modified Heliocentric Julian Date, RA,Dec args
scat: Fix bug which failed to read PPM catalog proper motions
scat: Debug separate search, catalog, and output coordinate system implementation
imcat: Deal correctly with rotated images
gethead: If null keyword value and padding on, print ___
newfits: Fix bug which wrote CTYPEn without quotes
Catalog subroutines: Check regions more carefully in search, not catalog, coordinates
getdate and dateutil.c: Add conversions to and from heliocentric Julian date

Version 3.3.0 (February 6, 2003)
scat,imcat,imwcs,immatch: Add support for USNO-B1.0 Catalog including minid and minpmq
scat: add argument ndec=n to set number of decimal places in output
sethead: fix bug parsing files of settings with quotes
gethead: initialize some uninitialized variables
ubcread.c: Add new subroutines to deal with USNO-B1.0 Catalog
tabread.c: Deal with proper motion in catalogs by enlarging search boxes
ty2read.c: include math.h because of use of fabs()
gsc2read.c: Fix bug so imwcs works with GSC II search results
proj.c: Use local copysgn() and copysgni() instead of (sometimes) system copysign
Change fopen option from "r" to "rb" in all binary-reading subroutines
so WCSTools will work under Windows

Version 3.2.1 (January 7, 2003)
delhead: Fix bug so arbitrary number of keywords can be deleted
xy2sky: Fix fatal bug in tab output from file, and ignore commented out input
file lines
wcsinit.c: Read PVi_0 for ZPN projection; initialize PVi_j only once

Version 3.2.0 (December 6, 2002)
getfits: New program to extract part of a FITS image preserving WCS
getdate: Add sidereal time conversion; fix bug in -now option
imsize: Fix bug which caused segv crash on Linux and OS/X
scat: Add VOTable output option (sr=degrees over web or -tt)
scat: Fix several minor bugs dealing with returned star counts and formats
scat: Add -n -1 option to ACT and Tycho-2 catalogs
scat: Add filtering by epoch of entry using -y y1,y2 option
sethead: Never overwrite a multiextension FITS file
setpix: Rewrite code so arbitrary number of ranges of pixels can be set
sumpix: Add -l option to print range and allow summing over entire image
catutil.c: Add VOTable header and trailer subroutines vothead() and vottail()
dateutil.c: Add sidereal time conversion
wcsinit.c: Fix subroutine calls for radial velocity and pole latitude
wcsinit.c: Fix computation of center pixel in image for default ref.  pixel
ctgread.c: Change UZC format from /f to /u; add /f for fractional hrs and deg

Version 3.1.3 (August 30, 2002)
scat: Fix bug which broke USNO-A catalog reading by number; fix UJC mag. bug.
scat and imcat: Print all available magnitudes in BINARY, ASCII and TABTABLE
catalogs and search catalogs to improve mergeability.
imwcs: Add -q n to increase number of parameters to be fit.
getcol: Read multiple files; add option to print pathname; add option to ignore comments
gethead: Ignore / if reading to end of line with -l in free-form files
getdate: Add option to convert files of date/time strings and ET conversion
imwcs: Set center and scale from prematched stars if not set on command line.
skycoor: If no coordinate system given, assume input and output both J2000
imio.c: Fix bug in getvec() which crashed when using scaled pixels
fileutil.c: Return 1 if file is stdin from isfile()
dateutil.c: Add conversion to and from ET/TDT/TT ephemeris time

Version 3.1.2 (July 8, 2002)
getdate: Fix command line parsing to handle negative (BCE) dates correctly
dateutil: Fix handling of negative years
dateutil: Fix fixdate() to leave in fractional seconds correctly

Version 3.1.1 (June 26, 2002)
gethead,imsize: Add -x option to specify FITS extensions for file list
gethead: Add -s option to drop space padding in tab-separated tables
getpix: Add -s option to print x y value lines without punctuation
imcat: Add back -a option to set a WCS rotation angle
wcshead: Add option to print rest wavelength limits using VELOCITY
hget.c: Fix bugs in hgetsc(), hgeti4c(), and hgetr8c()
wcsinit.c: If no WCS is present for a specified letter, return error.
wcsinit.c: Save name and letter of WCS in WCS data structure
tnxpos.c, iget.c, hget.c: Fix bugs dealing with multiple line keywords
so IRAF TNX projection works again.

Version 3.1.0 (April 12, 2002)
Implement WCSLIB 2.9
scat: Add web query sr= option for search radius in degrees
scat: Fix implementation of velocities in TDC binary catalogs
imcat,scat,imwcs,immatch: select any magnitude for sorting and limits (number or letter)
imcat: Fix bug so characters other than circles can be plotted
binread.c: Fix object name and velocity code
ty2read.c: Fix bug so magnitudes limits are used correctly
wcslib.c: Fix bug in WCSLIB 2.8.2 wcs.c code
wcsinit.c: Support PV entry of constants and PCi_j rotation matrices
wcs.c and wcsinit.c: Support inversion of multiple WCSs
hget.c: Add hgetri4c(), hgetr8c(), and hgetsc() for multiple WCS handling
edhead.c, fixpix.c, addpix.c, setpix.c, subpix.c, conpix.c, gettab.c,
newfits.c, imstack.c, imextract.c, remap.c, getcol.c, and getdate.c:
getcol: Add -g for medians of absolute values of selected columns,
-j for means of absolute values of selected columns,  -q for mean of
selected columns added in quadrature, and -x for ignorable value.
tnxpos.c: Fix bug parsing parameter strings with ddd. in them
Fix minor bugs found by True Unix C compiler

Version 3.0.7 (March 4, 2002)
gethead: Add -l option to return values to end of line
gettab:  Improve line range implementation
imcat and scat: Print spectral type for TDC format catalogs, if present
keyhead: Add time and angle conversions for 2dF keyword changes and
sethead and keyhead: Add -l command to log files as they are processed
catutil.c: Fix agets() to work with keywords at start of line
catutil.c: Add option in agets() to return value to end of line or /
tmcread.c: Fix catalog name in web access
wcscon.c: Fix precession units problem in ecl2fk5() and fk52ecl()
wcsinit.c: Add XPIXSIZE/YPIXSIZE (KPNO) as additional image scale keywords

Version 3.0.6 (January 24, 2002)
imwcs, immatch: Allow arbitrary argument order on command line
imwcs: After first pass, use WCS and tolerance for matching, if possible
imwcs: set minimum number of matches to cut matching loop (minmatch=value)
       (default 40)
       and minimum number of stars for WCS fit (minstars=value) (default 3)
imcat: Add -y to set epoch of image
scat, imcat, skycoor: accept fractional year or FITS date for epoch
scat: If RA search size is given, divide by cos(dec) for true arcseconds
scat, imcat, imwcs, immatch: Improve error reporting
getcol:  Add sum, mean, sigma for hh:mm:ss and dd:mm:ss entries
  Add -e option to print medians of values in selected columns
  Add -f option to print ranges of values in selected columns
  Add -p option to print only sum, mean, sigma, or range, not entries
  Ignore non-numeric values for sums, means, ranges, and medians
gettab: Fix bugs to deal with conditions correctly
skycoor: Add -o argument to offset coordinates by arcseconds
xy2sky: Add option to prepend RA and Dec to input tab table (-a -t) for output
conpix: Use random() instead of drand48() for portability
imrot, imwcs, immatch, imstar: Fix rotation of 8-bit images
imstar: Add istat=0 option to avoid recomputing noise; improve code
sethead: Add options to add comments to keywords from files and command line
sethead: Allow use of stdin for input of keyword assignments
sethead: Add -s to set character used for spaces in argument strings
wcsinit.c: Use WCSDIM for number of axes if NAXIS is zero or absent
ctgread.c: Fix Tycho-2 call argument error so scat, imcat, imwcs, immatch work
matchstar.c: Try matching with current WCS before trying all possible offsets.
uacread.c, gscread.c: Include math.h
lin.c: Include stdlib.h instead of malloc.h for portability
imio.c: Add 8-bit to 8-bit transfers to movepix()
tabread.c: Fix initialization problems in header reading subroutine tabhgetc()

Version 3.0.5 (September 27, 2001)
Implement WCSLIB 2.7
Fix bugs in tabread() which didn't appear on Solaris, but did on Linux and Alpha Unix
Fix bugs in gethead in printing values from free format ASCII files
Add magnitude name to heading limit specification
hget.c: Fix bug in str2dec() which misinterpreting strings with leading spaces
hget.c: Fix bug in isnum() which caused bad answer if trailing spaces
scat,imcat,immatch,imwcs: USNO-A2.0 and HST-GSC catalogs now available over web
webread.c: Debug code to use ESO USNO-A2.0 and GSC servers
ctgread.c: Fix bug dealing with radial velocities

Version 3.0.4 (September 19, 2001)
imwcs, imcat, scat, immatch: rewritten to deal with arbitrary numbers of mags
imcat, scat: -s command now allows sorting by RA, Dec, and Mag(n), X, and Y
imwcs, immatch: -k command selects magnitude for reference star selection
hget.c: Decode yyyy/mm/dd as a date string in hgetdate()
webread.c: free all memory which is allocated
tmcread.c: flag magnitudes with rd_flag indicating high uncertainty
sortstar.c: modified to handle arbitrary numbers of magnitudes and specified
            sort magnitude
*read.c: arguments include single 2-D magnitude array and sort magnitude

Version 3.0.3 (August 24, 2001
sethead: Fix bug which failed to assign FITS or IRAF filenames to keywords
scat: Pass on velocities from TDC ASCII and Starbase catalogs
ctgread.c, tabread.c: Deal with velocities and object names better

Version 3.0.2 (August 2, 2001)
imwcs: Allow less than three star matches if only 1 or 2 parameters fit

Version 3.0.1 (July 25, 2001)
xy2sky: Add -x argument to specify columns for x,y, -m for magnitude column,
 and -c for file containing magnitude calibration polynomial
immatch: Add -q argument to fit image magnitude to catalog magnitude polynomial
imstar: Return image instrumental magnitudes instead of flux
getcol: Fix bug so that stdin can be used for input file
scat: Fix various web access bugs
binread.c: Fix bug so that catalogs not in specified directories can be found
imsetwcs.c: Add code to fit image magnitudes to catalog magnitudes
polfit.c: New file with polynomial fitting and evaluation subroutines

Version 3.0 (July 12, 2001)
scat, imcat, imwcs, immatch: Add support for GSC II, GSC-ACT and 2MASS Point
 Source Catalogs
scat, imcat:  Add parallax to Hipparcos catalog output and 4 fluxes to
 IRAS Point Source output
scat: Add help to web interface
delwcs.c: Add PC matrix to keywords deleted
getcol.c: Add -b to read vertical-bar-separated columns to include spaces
 and -i to read tab-separated tables correctly
gethead.c: Add -g for keyword=val<lf> and print same way if -v
gettab.c: Create output tab tables from stdin without crashing
imcat.c: Add option to set regions in pixels as well as arcseconds
remap.c: Set default center to center of output image, not input; deal with
 projection changes correctly
scat.c: Rewrite sort options, adding sort by declination and no sort at all
scat.c and imcat.c: Clean up heading alignments; add band and n to GSC output
skycoor.c: Add -i option to specify radian input
binread.c: If 4 magnitudes, stash last two in integer*4 type
catutil.c: Fix bug which caused parsing failure on quoted tokens
catutil.c: Add GSC-ACT, 2MASS PSC, and GSC II catalogs
dateutil.c: Add options to convert to and from year,day-of-year
dateutil.c: Add fractional day on ISO FITS string as well as UT time.
gsc2read.c: New subroutines to read GSC 2.2 catalog over the web
hget.c: Fix possible problems in header length setting
gscread.c: Add support for GSC-ACT with separate file path from GSC
tmcread.c: New subroutines to read ASCII version of 2MASS Point Source Catalog
ty2read.c: Extend search limits so searches do not slip between region limits
 and fix bug which caused last region on index list not to be checked.
wcsinit.c: Read PROJPn projection constants, not PVn
webread.c: Make a separate subroutine, webbuff(), to get data given a URL

Version 2.9.3 (March 23, 2001)
This is a bug-fix release which fixes compilation problems on HP-UX and Linux
and problems with access to the SAO and PPM catalogs under certain conditions.
binread.c: fixed use of PPM_PATH, SAO_PATH, and WCS_BINDIR in binread()
catutil.c: Fixed PPMra definition in RefCat()
getcol.c: dropped declared arguments from one subroutine declaration
webread.c: dropped declared arguments from one subroutine declaration
           fixed webrnum() so it works
scat.c: fixed handling of epoch when not specified
wcs.h, wcs.c, wcsinit.c, wcslib.c, cel.c:  Fixed minor bugs which caused
Linux compilation errors.

Version 2.9.2 (March 12, 2001)
fitsfile.c, fitswcs.c: Change WCS selection character from : to %
fitsfile.c: Fix bug which caused crash on reading multi-extension FITS files
fileroot: New program used by saom* scripts to create match catalog file name
Add shell scripts which use SAOimage to overplot and match star catalogs in
the SAOimage.scripts subdirectory.
Help messages now print my e-mail address to make it easier to complain about
bugs (or compliment me for features which work).

Version 2.9.1 (March 2, 2001)
wcsinit.c: Fix bug which read CRPIX1 as CRPIX2 as well as CRPIX1
scat: Add option -z to append to pre-existing file (for SAOimage star matching)
imsetwcs.c: Fix bugs with pre-matched stars.

Version 2.9.0 (February 23, 2001)
wcsinit.c, wcs.c, wcs.h: Implement sequentially dependent WCS's
fitsfile.c: Debug multiple WCS implementation with multi-extension FITS files
Specify WCS as file.fits:wcs or files.fits,extnum:wcs , where wcs is either
the WCSNAME, if present in the header or WCS character.

Version 2.8.7 (February 15, 2001)
imwcs: Implement -u initial matches, though matches do not set initial WCS
 Direct all diagnostic output to stderr so it comes out in the correct order
 if it is sent to a file.  Fix overwriting output image so it works even if
 final header is longer than original header.  Fix -o option so it can either
 overwrite the input file or specify file.
imrot: Fix -o option so it can either overwrite the input file or specify file.
binread and ctgread: if pole is included, search entire RA range of RA-sorted
 catalog
wcslib.h, lin.c, proj.c: minor updates from WCSLIB 2.5 to WCSLIB 2.6 (May 2000)
wcsinit.c: New subroutines wcsinitn(header,name) and wcsinitc(header,char)
 allow use of multiple WCS's, though no dependent ones yet.

Version 2.8.6 (January 2, 2001)
scat, imcat, imwcs, immatch: Read catalogs across the web from CGI scat
webread.c: New subroutines to read catalogs via http
scat: Improve error handling and feedback
scat: Read USNO plate catalogs reformatted like UJC
imwcs: Implement first pass at dealing with pre-matched stars
ujcread.c: Add code to read USNO plate catalogs (ra, dec, mag)
tabread.c: Read proper motion in seconds/century as well as seconds/year
hget.c: isnum() now rejects strings with embedded hyphens so that ISO dates
are aligned as strings in FITS headers, not as right-justified numbers.

Version 2.8.5 (September 29, 2000)
scat, imcat: Print approximate spectral type instead of plate number for A2.0
scat: Print spectral type and 2nd mag in one-line closest star output format
imrot: Echo only new file name if not -v output, use _EXTNAME if extraction
catutil.c: Add br2sp() to approximate USNO-A2.0 spectral types
ctgread.c: Implement multiple maginitudes and spectral types in ASCII catalogs
uacread.c: Approximate spectral types from "B" and "R"
wcsinit.c: Use CD matrix if any of CDi_j are present

Version 2.8.4 (September 6, 2000)
imstack: Add -o option to set output filename
scat: Print leading zeroes in ID numbers for -f option search centers
i2f: If pixel file not found, look in same directory as header file
catutil.c Add option in CatNum to print leading zeroes if nnfld > 0
imhfile.c: Use header directory if pixel file not found at its pathname

Version 2.8.3 (August 3, 2000)
setpix:  Add -a, -s, -m, and -d options to operate on existing pixel values
in image sections with a constant.
wcshead: Add -w option to print limits of 1-D images (often spectra)
scat: Add ASCII catalog /x option to use X Y instead of spherical coordinates
imcat, scat: Preserve star catalog structure between calls to avoid rereading
Starbase and TDC ASCII and binary catalog files buffered in memory.
imrot: Add -s option to split multi-extension FITS files to _n.fits
newfits: Add -i option to fill data section of new FITS file from binary file
wcs.c: Use keyword rotation angle for one-dimensional file
imsetwcs.c: Fix bug which caused occasional segv, introduced in 2.8.0
dateutil.c: Fix bug so ep2jd() and jd2ep() both start at 1/1 0:00
catutil.c: Fix CatNum() and CatNumLen() to deal with integers > 10 digits
tabread.c: Return actual catalog number from tabrnum()

Version 2.8.2 (June 13, 2000)
scat, imcat, immatch, imwcs: Fix bug which reversed Tycho-2 B and V magnitudes
gethead: If -p, always print filename, even for one file
ty2read: Fix bug which reversed B and V magnitudes (spectral type was OK)
imhfile.c: If pixel file has no directory, always use same as header file

Version 2.8.1 (June 9, 2000)
scat, imcat, immatch, imwcs: Fix reading of USNO-A2.0 on PCs and Alphas
gethead, sethead, delhead, cphead, keyhead: Improve error reporting
uacread.c: Fix bug detecting byte-swapping on some files on PCs and Alphas
hget.c: Get keyword values even if equal sign is not present

Version 2.8.0 (June 2, 2000)
scat, imcat, immatch, imwcs: Implement Tycho 2 astrometric catalog
tabread.c: Read from any table in a multiple-table Starbase file
wcs.c: If CTYPEn is not found, default to LINEAR, no error
imgetwcs.c: Print debugging coordinates in degrees if wcs->degout is set
ty2read.c: New subroutines to deal with the Tycho 2 catalog
and a variety of other bugs fixed.

Version 2.7.3 (May 1, 2000)
imhfile: Fix bug and clean up code dealing with pixel subdirectories
dateutil: Years from old FITS format or system less than 1000 get 1900 added
hput: Bug in hadd() fixed so line is not overwritten.
scat: Allocate search buffers once to speed multiple-object searches
ctgread: Implement missing /d catalog flag for positions in degrees.

Version 2.7.2 (March 28, 2000)
cphead: New program to copy keyword values between headers
gethead: Add extraction of keyword= values from any ASCII file
         Add conditions for use of specific header files
         Add replacement of embedded spaces with underscores
getcol and gettab: Add conditions for use of lines in files
imwcs: Allow iterating without then with tolerance reducing in one run
imcat and scat: Improve handling of Starbase tab table catalogs
                Clean up output formatting
platepos.c: Use inverse CD matrix to get better initial x,y value
imgetwcs.c: Set reference pixel value to output system (bug fix)
hput.c: Do not add quotes if writing COMMENT or HISTORY using hputs()
imhfile.c: Minimize length of path in pixel file name, fix bug dealing with
           very long file paths.
dateutil: Fix bug causing 2000-02-29 to appear as 2000-03-01; other dates OK.
          Add conversion routines for current local and UT times.
Proper motion reporting has been implemented in scat and imcat with
additional modifications to ctgread.c, tabread.c, actread.c, and binread.c

Version 2.7.1 (February 15, 2000)
cphead: New program to copy keyword values between headers
imwcs and immatch: Increase limit of matches to 500
getcol: improve parsing of ranges of columns and lines
gethead: Add optional output format which can be input to sethead
tabread: implement proper motions in Starbase tab table files
imstack: add option to stack a single image on itself n times and fix bugs

Version 2.7.0 (February 3, 2000)
Update WCSLIB subroutines to version 2.5, which was released in December
imrot: Fix bug so new file is created if only BITPIX is changed
skycoor: Fix bug so degree conversion works for coordinates from a file
getdate, dateutil.c: Add support for modified Julian date

Versdion 2.6.12 (January 13, 2000)
scat, imcat: Fix output of Starbase tab table catalogs
gettab:  If no column names are specified, entire lines where tests are
         met are printed.
dateutil.c:  If old FITS format date is 100, it is assumed to be 2000
             Writing 100 in the year field is a typical Y2K failure.
             The software already interprets 00 as 2000.
tabread.c:  Fix bug in tabopen(); return id if *_id present; count decimals
imhfile.c:  Fix bug in iraf2fits() which dropped keyword after OBJECT

Version 2.6.11 (December 20, 1999)
conpix:  Added -c (set constant), -r (square root), and -g (Gaussian noise)
getcol:  Add -t conversion to tab-separated table
sethead: Add -d option to change date from old FITS format to new FITS ISO
         format.  This works on dates of format dd/mm/yyyy as well as dd/mm/yy
setpix:  Fix bugs
getpix:  Fix bugs so that upper and lower pixel limits can be used together
getdate: New program which uses dateutil.c to do many date and time conversions
imio.c:  Round all float and double conversions to integer
tnxpos.c: Fix several bugs; set wcs->rot using wcsrotset()
wcsfort.c: Add error handling and better internal documentation
dateutil.c: Fix bugs and add more conversions
hget.c:  Fix bug extracting minutes and seconds from FITS ISO time string

Version 2.6.10 (December 9, 1999)
remap:   Added -i flag to set output BITPIX and avoid overflows
getpix:  Added -g and -l options to print only pixels within value limits
hget.c:  Fix bug in isnum() so numeric strings starting with d or e are
         not decreed to be numbers.
dateutil.c: Fix bug in ts2jd() which caused JD to be much too big

Version 2.6.9 (December 1, 1999)
edhead:  Added -e option to select an editor and none editor option to
         simply filter a header, removing control characters without editing
gethead: Added -u option to always print underscores if keyword not found
         and -f option to never print filenames
imwcs:   Now copies images without reading them to memory if image catalogs
         computed externally; fixed bug which broke iterations, and handle
         dataless headers with separate image catalogs
getcol:  Add -a, -c, and -m options to get sums, counts, and means of columns
imhead:  Add options to output exact FITS header and set BITPIX to 0
sethead: Fixed bug which wrote character string keyword values twice
remap:   Added galactic coordinate output option
scat, skycoor:    Fixed bug when setting epoch or equinox on command line
imhfile.c: Delete all keywords read from binary part of header before writing
           a new .imh file
wcs.c:   Fixed bug which caused NCP to be ignored in wcstype()
findstar.c: Allow image catalog filename to be up to 256 characters
tabread.c: Improve error checking; istab() returns 1 only if column headers

Version 2.6.8 (November 5, 1999)
immatch, imstar, and imwcs now read Starbase files as well as DAOPHOT-format
files for star x-y input (-d).
sumpix: Add options to compute means, variances, and standard deviations
newfits: bugs fixed
getcol is a new task for getting information from ASCII space-delimited tables.
lint was run on all source code, and it was cleaned up
iraf2fits:  Add keyword DATE-MOD with binary time translated to FITS date
imhfile.c: A major memory leak fixed after Jean-Baptiste Marquette ran
Insure++ on the code
catfile.c change to ctgfile.c and cat*() subroutines renamed to ctg*() to
avoid conflicts with standard C catopen() and catclose() calls.
catutil.c: Fix bug in getoken() which lost last character on line
tabread.c, fitsfile.c: memory allocation cleaned up
findstar.c: Use of pointers cleaned up; read tab tables as well as DAOPHOT format
dateutil.c: Fix bug to return epoch if fractional year given (-y arguments)

Version 2.6.7 (October 21, 1999)
fitsfile.c: Set header length lhead0 in hget.c when allocated or reallocated
imhfile.c: Set header length lhead0 in hget.c when allocated
hput.c: Check length of header and return error if trying to write beyond end.
setpix.c, sethead.c: Reallocate header and try again if hput returns error
setpix.c: Fix subroutine arguments after lint

Version 2.6.6 (September 28, 1999)
scat: Fix access to GSC by number
i2f: Add option to write to standard output
fixpix: Fix bugs
remap: New program
gscread.c: Fix table allocation bug
imhfile.c: Don't copy OBJECT keyword from .imh file; use binary i_title
fitsfile.c: Add option to write to standard output as filename stdout
imio.c: Add new subroutines to add to a pixel (addpix) and use FITS one-based
        in addition to C zero-based image coordinates.

Version 2.6.5 (September 16, 1999)
scat: Fix bug which returned inconstent results from distance sorts.
scat.c, imcat.c, imsetwcs.c: Rewrite catalog access so it all goes through
catread(), catrnum(), etc.  Add distsort argument to all *read() calls.
catread.c:  Add argument for catalog type from RefCat(), and add code to call
access routines for each type of catalog supported by the package.
imio.c: Fix scaling code which caused problems on some compilers
tabread.c:  Fix coordinate system problems
matchstar.c: Fix bug initializing CD matrix

Version 2.6.4 (August 31, 1999)
scat.c: Fix -r before decimal coordinates. Fix long/lat and 0:00 search bugs.
imcat.c and scat.c: Fix formatting and -n option
immatch:  Fix fatal bug caused by changes to imwcs subroutines
sethead.c: Write multiple keywords of form name_i when character value too long
gethead.c: Concatenate multi-line keyword values in new sethead format
gethead.c, delhead.c, sethead.c, keyhead.c:  Programs rewritten to deal
more completely with files of keywords and image files
fileutil.c: New subtroutines to compartmentalize file information gathering
hget.c: hgetm() now reads name_i, name_ii, and name_iii(IRAF) multiline keywords
gscread.c, uacread.c, ujcread.c, binread.c: Call RefLim() to set catalog search
ujcread.c: Fix bug when number of stars found exceeds maximum
limits and fix test when search area passes through 0:00 RA
wcs.c:  Print dd:mm:ss (not hh:mm:ss) dd:mm:ss for long/lat coordinates if
        degout=0

Version 2.6.3 (July 9, 1999)
imwcs.c, immatch.c, imstar.c: Fix command line rotation angle setting
imgetwcs.c: Fix bug when converting image coordinates to reference system
imgetwcs.c: Fix bug so command line reference pixel is used correctly
imsetwcs.c: Fix bug which reinitialized CDELT1 incorrectly when iterating
sumpix.c: New program to add pixel values over rows. columns, or regions
dateutil.c: New file with many date and time conversion subroutines
fitswcs.c: Do not write J2000 or B1950 as RADECSYS; use FK5  and FK4

Version 2.6.2
imrotate.c: Fix bug which caused overflow in history header line
imrotate.c: Rewrite to return pointer to rotated image
gethead.c: Fix bug which sometimes caused garbage at start of output lines
imstar.c: Add option to set brightest star in image to arbitary magnitude
All catalog subroutines now use SearchLim() to set RA and Dec limits

Version 2.6.1
scat.c: Fix bug if -r last command; allow sexigesimal degree search radius
scat.c: Allow rectangular search box (-r radius or -r width height)
newfits.c: Create FITS files as they appear in command line unaffected by
           subsequent command line arguments.  Allow center to be set as
           standard WCSTools coordinate string (ra dec system)

Version 2.6 (June 4, 1999)
conpix.c: Operate on all pixels of an image (new)
gettab.c: Extract values from a tab table file (new)
newfits.c: Make dataless or blank FITS image files (new)
imextract.c: Extract 1D file from 2D file or 2D file from 3D file (new)
imwcs.c, imcat.c, immatch.c, scat.c:  Add support for ACT catalog
scat.c: Add number ranges, search from catalog file of centers
immatch.c, imwcs.c: Add catalog selection through symbolic link to executable
skycoor.c: Add options to get separations and convert in and out of cartesian
           equatorial coordinates
gethead.c, delhead.c, keyhead.c, sethead.c: Deal gracefully with any number of
           command line arguments, ignoring those past limiting number
getpix.c and setpix.c:  Now work with 1-d images as well as 2-d images
actread.c: New subroutines to read ACT catalog (new)
catutil.c: Repackaging and new subroutines for catalog identification, range
           decoding and date format conversion
binread.c: Fix bug with 0h wraparound searches
catread.c: Rewrote parser, allow coordinate system per star
fitsfile.c: Allow 0-data-byte files and BITPIX=0 for data-free WCS fits
imgetwcs.c: Allow negated scales to flip axes
tabread.c: Rewrote and generalized tab table access to use same structures as
           binread() and catread()
wcs.c: Fix latitude for NPA and SPA coordinate systems
       For quad cube projections, z=0-5 (faces) instead of 1-6
       Add file name to error messages, if available
wcsinit.c: Set rotation angle correctly for DSS projection
           Add PIXSCALE as possible plate scale keyword (arcsec/pixel)
           Return an error message for all WCS failures
           Fix bug in dealing with EPOCHless non-equatorial coordinates
wcshead.c: Change name of subroutine to avoid conflict with wcslib subroutine

Version 2.5 (December 8, 1998)
edhead.c: make temporary file in /tmp and delete it when done
imcat.c, scat.c imwcs.c, immatch.c: Add code to read TDC ASCII, USNO-A2.0,
 and USNO-SA2.0 catalogs
imcat.c, imstar.c: add output options to create SAOimage region file of stars
imwcs.c:  add access to TDC binary catalogs such as SAO, PPM, and Tycho
imwcs.c:  fix bugs in coordinate system handling
keyhead.c: add option to transfer keyword values within a header
gscread.c, uacread.c, ujcread.c, tabread.c, binread.c: An egregious error
which failed to reassign numbers when dropping faint or far stars when
there were too many for the desired return was fixed 
catread.c: new subroutines to read TDC ASCII catalogs
wcs.c:  fix bug when dealing with rotation of mirrored (right-handed) systems
wcsinit.c: Read projection constants neaded for some WCSLIB projections
fitsfile.c: add isfits() subroutine so unsuffixed files can be identified
imhfile.c: Use file pointer to get file length; add isiraf() subroutine
uacread.c: Add support for USNO A-2.0 catalog and USNO SA-2.0 catalog
wcslib.h: combine lin.h, cel,h, proj,h, and wcstrig.h into wcslib.h
fitsfile.c: fix bug to deal correctly with very large headers

Version 2.4.1 (September 15, 1998)
scat.c, imcat.c: Add code to read TDC binary catalogs
binread.c: new subroutines to read TDC binary catalogs
star.h: new data structure for TDC binary catalogs
uacread.c: bug fix for reading USNO A 1.0 CDROMs
dsspos.c, tnxpos.c: minor bug fixes
ssao,sppm,siras: new links to scat to search SAO, PPM, and IRAS Point Source
                 Catalogs
imsao,imppm,imiras: new links to imcat to search SAO, PPM, and IRAS Point
                    Source Catalogs

Version 2.4 (September 4, 1998)
sethead.c: new arguments to add history to header
sethead.c delhead.c keyhead.c: Write whole file if modifying primary header
All files now transfer the extension from the input file if writing a new file
i2f.c: Write .fits files instead of .fit; write HISTORY line
wcs.c: Up to 10 commands may be preset
hput.c: Add getltime() and getutime() to set ISO local time and UT strings
wcs.h: Added pa_north, pa_east, imrot, and imflip to show image orientation

Version 2.3.4 (July 28, 1998)
delwcs.c: New program to delete keyword entries from image headers
sethead.c: Updated to allow multiple files to be changed
imhio.c: Properly sets modification date; memory management bugs fixed

Version 2.3.3 (July 24, 1998)
imhio.c:  Fix major bug by writing length of header to IRAF .imh files

Version 2.3.2 (July 16, 1998)
wcslib.c, wcs.c: Correct implementation of CSC, and probably all, quad cube
projections.
sky2xy.c: Add third dimension in output for quad cube projections
xy2sky.c: Add -f <num> for third dimension of input for quad cube projections.

Version 2.3 (July 10, 1998)
Restructure WCS initialization subroutines, putting keyword-dependent
stuff into wcsinit.c
wcs.c: Add wcskinit() to initialize WCS from keywords obtained elsewhere
wcs.c: Add wcsndec() to set number of decimal places output by pix2wcst()
wcs.c: Fix wcscdset() to deal with all possible cases correctly
wcs.c: Change setlinmode() to setwcslin() and setdegout() to setwcsdeg().
wcsinit.c: Fix bug reading 1-dimensional FITS files
wcsinit.c: Fix several initialization bugs discovered on Alpha version
wcs.c: Add ICRS as RADECSYS value (acts like FK5)
wcsfort.c:  Add Fortran interface in wcsfort.c
wcs.c: Use AIPS subroutines of CAR projection to avoid WCSLIB bug
scat.c: Add equinox options to and fix other bugs
imcat.c: Add equinox options to and fix other bugs

Version 2.2.1 (June 2, 1998)
Fix bug in hput() so blank lines before END are filled correctly
Fix fatal bug in tabread()

Version 2.2 (May 14, 1998)
Compute pixels from galactic coordinates correctly.
Implement arbitrary equinox in form Jyyyy.ffff or Byyyy.ffff.
Modify polynomial WCS to be closer to what is being discussed in fitswcs.
Add support for ecliptic coordinates, and improve coordinate conversion.
Fix pixel to WCS IRAF TNX projection; WCS to pixel still has problems.
Add support for IRAF unsigned data types

Version 2.1 (March 31, 1998)
Add polynomial plate fit and IRAF TNX projection.  Fix various bugs.
Fit CD matrix as well as CDELT/CROTA.
Add iteration and recentering to IMWCS.

Version 2.0 (February 18, 1998)
Use Mark Calabretta's WCS code instead of AIPS classic WCS subroutines
for the standard FITS projections.

Version 1.5 (December 15, 1997)
Rewrite IRAF code to deal with IRAF 2.11 reformatted headers.  Fix a variety
bugs.  Switch to single catalog search and image-based catalog search programs,
invoked by different names for different catalogs.

Version 1.4 (October 16, 1997)
Rewrite FITS code to deal with FITS image extensions.  Fix bugs in fitting
routine and deal with off-axis images, such as those from CCD mosaics.

Version 1.3.1 (April 25, 1997)
Fixed major bug in USNO A-1.0 and USNO SA-1.0 catalog reading which ignored
stars which are flagged as being in the Guide Star Catalog

Version 1.3 (February 24, 1997)
Fixed pointer tests to check for NULL rather than 0 so they will work
properly in Linux.  Coordinate conversion inconsistencies were repaired.
All programs which only use header information call a common subroutine
to read the header.

Version 1.2.2 (January 27, 1997):
Fixed bug in HGET which ignored exponent of floating point string when
extracting an integer due to use of atoi() instead of (int)atof().
This most often affects how EPOCH is interpreted.

Version 1.2.1 (January 15, 1997):
Fixed bug in RA sorting which affected all catalog search programs
