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 cvtsixty).
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
    DEGREES - Flag, if set it means the input is in decimal degrees.
    SEPCHAR - Separator character for the fields in the position.
                 Default=':'.  Warning, if you do not use ':' then the
                 string may not be parsable by raparse.
 OUTPUTS:
  str    - formatted string
 KEYWORD OUTPUT PARAMETERS:
   ERROR - Flag (scalar or vector), set if an error was seen.
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Lowell Observatory, 2001/10/09
  2009/04/26, MWB, converted to use new CVTSIXTY routine