NAME:
  desalt
 PURPOSE:
  Flag fake objects in .obj files that were originally generated by imsalt
 DESCRIPTION:
  Read an object list from two files, one working obj file, one containing
  the salted objects.  Compare them, determine which objects are salted and
  write "s" into the working obj file to identify them as salted objects.
 CATEGORY:
  Astrometry
 CALLING SEQUENCE:
  rdobjlist,objfile,saltfile
 INPUTS:
  objfiledir  - Location of working obj files to be read.
  saltfiledir - Location of obj files containing just the salted objects.
 OPTIONAL INPUT PARAMETERS:

 KEYWORD INPUT PARAMETERS:
  THRESHOLD - distance found-object can be from salted object (in pixels)
                 default = 3 pixels

 OUTPUTS:

 KEYWORD OUTPUT PARAMETERS:

 COMMON BLOCKS:

 SIDE EFFECTS:

 RESTRICTIONS:

 PROCEDURE:

 MODIFICATION HISTORY:
  2004/07/12, Written by Julie Kane, MIT
  2004/07/18, JFK, added support for multiple files
  2004/07/22, MWB, final debug