NAME:
  mon2num
 PURPOSE:   (one line only)
  Convert the name of a month to its integer equivalent.
 DESCRIPTION:
 CATEGORY:
  Utility
 CALLING SEQUENCE:
  mon2num, name, num
 INPUTS:
  name - String or string array with the name of a month, the case does
            not matter and the string need only be long enough to be unique.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  num - Number of the month (1=Jan, 2=Feb, etc.)
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
  If the name you give is not unique, the first match is returned.
  If the name you give is not correct, you get a 0 back for that entry.
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Lowell Observatory, 2008/02/03