NAME:    
	dbcreate_wfc_frompos
PURPOSE: 
	read in wfc unmerged catalogues of one particular colour. 
	This program should be run on each of the 5 colours if a full catalogue
	is to be generated
	The differencence between this program and dbcreate_wfc_unmer is that 
	it uses the xpos and ypos columns to calculate ra and dec, rather than
	 the ra and dec columns directly
CALLING SEQUENCE: 
	dbcreate_wfc_frompos, file, db_out
INPUTS: 
	file: root name of files to be read ('wfc/r219698' for example)
OUTPUTS: 
    	db_out: string array, name of output database. 
       A db_out.dbd file will be created automatically
OPTIONAL OUTPUT PARAMETERS: 
    	none
EXAMPLE: 
	dbcreate_wfc_frompos, 'wfc/r219698','dbase/wfci'
DEPENDENCIES: 

RESTRICTIONS: 
        UNTESTED
CALLED PROCEDURES AND FUNCTIONS: 
	astrolib functions
	write_wfc_dbd
MODIFICATION HISTORY: 
     	29-Nov-1998  Original by Richard McMahon
     	09-Oct-2000  Modified by Suzanne Aigrain

(See /home/xmmssc/soft/idl/pro/dbcreate/dbcreate_wfc_frompos.pro)