NAME:
  strb62
 PURPOSE:
  Convert an integer into a Base 62 formatted string.
 DESCRIPTION:

 CATEGORY:
  Utility
 CALLING SEQUENCE:
  str=strb62(val)
 INPUTS:
  val - Integer (byte, int, long) to be converted
 OPTIONAL INPUT PARAMETERS:

 KEYWORD INPUT PARAMETERS:

 OUTPUTS:
  return is the string
 KEYWORD OUTPUT PARAMETERS:

 COMMON BLOCKS:

 SIDE EFFECTS:

 RESTRICTIONS:

 PROCEDURE:

 MODIFICATION HISTORY:
  99/02/23, Written by Marc W. Buie, Lowell Observatory
  2000/05/03, MWB, added bi-directional conversion capability.