NAME:
  perser
 PURPOSE:
  Automated asteroid period search tool.
 DESCRIPTION:
 CATEGORY:
  Photometry
 CALLING SEQUENCE:
  perser
 INPUTS:
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
   Written by Marc W. Buie, 96/10/18, Lowell Observatory
   99/07/23, MWB, added hp and hs options (hardcopies)
  2000/11/08, MWB, removed use of obsolete code constructs
  2002/09/03, MWB, changed Str_sep call to strsplit