NAME:
       rd_to_vector
 PURPOSE:
       reads a file line by line into a string array
 CALLING SEQUENCE:
       vector=rd_to_vector(file)
 INPUTS:
       file: path of file to be read in. Must have read permission
 OPTIONAL INPUT KEYWORDS:
       
 OPTIONAL OUTPUT PARAMETERS:
       
 EXAMPLE:
       vector=rd_to_vector('file')
 CALLED PROCEDURES:
       
 MODIFICATION HISTORY:
       09-Jan-2001  Original by Suzanne Aigrain

(See /home/xmmssc/soft/idl/pro/files/rd_to_vector.pro)