NAME:
  haparse
 PURPOSE:
  Convert Hour Angle (HA) string to radians.
 DESCRIPTION:

 CATEGORY:
  Astronomy
 CALLING SEQUENCE:
  ha=haparse(str)
 INPUTS:
  str - String (or array) to parse as an hour angle
 OPTIONAL INPUT PARAMETERS:

 KEYWORD INPUT PARAMETERS:

 OUTPUTS:
  return value is scalar or vector value of HA in radians
    Note - W,w,+ prefixes are all west hour angles (positive)
           E,e,- prefixes are all east hour angles (negative)
 KEYWORD OUTPUT PARAMETERS:

 COMMON BLOCKS:

 SIDE EFFECTS:

 RESTRICTIONS:

 PROCEDURE:

 MODIFICATION HISTORY:
  2002/03/14, Written by Marc W. Buie, Lowell Observatory