NAME:
  hastr
 PURPOSE:
  Convert an Hour Angle to a string.
 DESCRIPTION:
 CATEGORY:
  Astronomy
 CALLING SEQUENCE:
  hastr,ha,places,str
 INPUTS:
  ha     - scalar or vector, hour angle in radians
  places - output format and precision (see rastr).
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  str    - formatted string
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Lowell Observatory, 2001/10/09