NAME:
  setpage
 PURPOSE:
  Set size and location of plot on page to center the output.
 DESCRIPTION:
  This will do something only if the output plot device is PS or PRINTER.
    In that case, it will setup a centered page output.  The default is
    landscape mode with xsize=25cm, and ysize=19cm.
 CATEGORY:
  Utility
 CALLING SEQUENCE:
  setpage
 INPUTS:
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  LANDSCAPE - Flag, if set causes a landscape orientation output
  PORTRAIT  - Flag, if ste causes a portrait orientation output
                If you set both, you'll get portrait
  XSIZE     - width of output in centimeters, default for landscape is 25,
                default for portrait is 19.
  YSIZE     - height of output in centimeters, default for landscape is 19,
                default for portrait is 25.
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written 96/08/28, Marc W. Buie, Lowell Observatory