NAME:
  setusym
 PURPOSE: (one line)
  Set the user defined symbol to one of many shapes.
 DESCRIPTION:
 CATEGORY:
  Utility
 CALLING SEQUENCE:
  setusym,sym
 INPUTS:
  sym - Symbol to load into the user-defined type.
          1 - Circle
          2 - Plus sign
          3 - Asterisk
          4 - Diamond
          5 - Triangle, point up.
          6 - Square
          7 - X
          8 - Star
          9 - Triangle, point down.
         10 - Rotated square (45 degrees)
  Positive ==> filled shape, negative ==> hollow shape.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD PARAMETERS:
 OUTPUTS:
 COMMON BLOCKS:
 SIDE EFFECTS:
  Redefines the user defined type (psym=8)
 RESTRICTIONS:
 MODIFICATION HISTORY:
   Written by Marc W. Buie, Lowell Observatory, 1992 Sep 21
   98/02/19, MWB, added new symbols 2-9