NAME: 
  saltdes
 PURPOSE:   (one line only)
  Implant fake objects into all relevant images on one night of DES data.
 DESCRIPTION:
 CATEGORY:
  CCD data processing
 CALLING SEQUENCE:
  saltdes
 INPUTS:
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  KEYFILE   - Name of a file containing a header keyword correspondence list.
  IMDIR      :String, the path to the original images- DEFAULT:current dir
  PSFDIR     :String, the path to the psfs- DEFAULT:SRCDIR+'/psf'
  SRCDIR     :String, the path to the src and srd files- DEFAULT:current dir
  OUTDIR     :String, set the path for the output data file. IMSALT
              will not run if imdir=outdir - DEFAULT:'salted/'
  OVERWRITE  :Flag, if set will force program to re-salt previously salted
                data.  Any prior salting products are removed and the fake
                data is completely re-generated (and will be different).
  QUIET      :Flag, if set will suppress chatty printed output.
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 SIDE EFFECTS:
 RESTRICTIONS:
  For use with the DES.
 PROCEDURE:
 MODIFICATION HISTORY:
  2004/07/14, Written by Maureen Teyssier, REU Lowell Observatory
  2004/07/16, MWB, incorporated into library.
  2004/07/17, MWB, added OVERWRITE keyword
  2004/08/13, MWB, fixed bug with imsalt call on x2+ extensions
  2004/10/15, MWB, fixed bug with ecliptic angle at RA=0
  2004/11/10, MWB, fixed bug when no F or S fields.