GETTOK

       Retrieve the first part of a (vector) string up to a specified character

       GET TOKen - Retrieve first part of string until the character char
       is encountered.

       token = gettok( st, char, [ /EXACT ] )

       char - character separating tokens, scalar string

       st - string to get token from (on output token is removed),
            scalar or vector

       token - extracted string value is returned, same dimensions as st

       /EXACT -  The default behaviour of GETTOK is to remove any leading
              blanks and (if the token is a blank) convert tabs to blanks.
              Set the /EXACT keyword to skip these steps and leave the
              input string unchanged before searching for the  character
              tokens.

       If ST is ['abc=999','x=3.4234'] then gettok(ST,'=') would return
       ['abc','x'] and ST would be left as ['999','3.4234']

       REPCHR()

       version 1  by D. Lindler APR,86
       Remove leading blanks    W. Landsman (from JKF)    Aug. 1991
       Converted to IDL V5.0   W. Landsman   September 1997
       V5.3 version, accept vector input   W. Landsman February 2000
       Slightly faster implementation  W. Landsman   February 2001
       Added EXACT keyword  W. Landsman March 2004
       Use COMPLEMENT keyword to WHERE W. Landsman   March 2004

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