NAME:
  mosplot
 PURPOSE:
  Plot Mosaic astrometric solution for DES data and do astrometry.
 DESCRIPTION:
 CATEGORY:
  Astrometry
 CALLING SEQUENCE:
  mosplot,root,first,last,ext
 INPUTS:
  root - root of data area and file names
  first - number of first image to plot
  last  - number of last image to plot
  ext   - (single) extension number to work
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  KPNO - If set, generates overview plot of plane-of-sky orientation for
           the Kitt Peak Mosaic camera.  Otherwise, the orientation for
           Cerro Tololo is used.
  SKIP - If set, quietly skips frames with no valid solution.
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Lowell Observatory, 2001/08/28
  2001/10/09, MWB, added KPNO keyword flag
  2002/04/16, MWB, changed the command option structure and added help
  2002/04/25, MWB, changed the default option operation to be adaptive
  2002/08/11, MWB, added SKIP keyword flag