NAME:
  cloneast
 PURPOSE:   (one line only)
  Clone astrometric solutions from one night to another
 DESCRIPTION:
 CATEGORY:
  Astrometry
 CALLING SEQUENCE:
  cloneast,otherdir,offset
 INPUTS:
  otherdir - String pointing to the other directory from which to get
                astrometric solution
  offset   - Numeric offset of file name.  Files are named YYMMDD.nnn in
                each directory.  When linked, the root name is changed and
                the other frame has the offset added to the suffix number.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  OVERWRITE - if set, overwrite solution, otherwise skip frames with
                 pre-existing solutions
  MAXOTHER  - Largest image number to copy solution from in the other
                 directory.  Default=199.  This prevents cloning a solution
                 that has already been cloned.  Set to 0 to suppress this
                 check.
  DIGITS    - number of digits for the suffix of the image name, default=3
  NOSAVE    - flag, if set, prevents making any changes to files or copying
                 anything.  Use this for a dry run to see if it's going to
                 work ok.
  RANGE     - Optional numeric range of things to clone from the other
                 directory.  This is usually not required if you are providing
                 values in offset and are using MAXOTHER.  If these two
                 inputs are set to zero then RANGE is a required input.
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Lowell Observatory, 2003/06/23
  2003/07/03, MWB, added MAXOTHER keyword
  2004/07/21, MWB, added creation of symbolic links for srd and psf files
  2009/08/05, MWB, modified for new rd/wrastfc versions
  2013/09/03, MWB, added DIGITS, NOSAVE, and RANGE keywords, further mods
                     for even newer rd/wrastfc