GETWRD

       Return the n'th word from a text string.

       wrd = getwrd(txt, n, [m])

       txt = text string to extract from.         in
         The first element is used if txt is an array.
       n = word number to get (first = 0 = def).  in
       m = optional last word number to get.      in

         LOCATION = l.  Return word n string location.
         DELIMITER = d. Set word delimiter (def = space & tab).
         /LAST means n is offset from last word.  So n=0 gives
           last word, n=-1 gives next to last, ...
           If n=-2 and m=0 then last 3 words are returned.
         /NOTRIM suppresses whitespace trimming on ends.
         NWORDS=n.  Returns number of words in string.

       wrd = returned word or words.              out

       getwrd_com

       Note: If a NULL string is given (txt="") then the last string
             given is used.  This saves finding the words again.
             If m > n wrd will be a string of words from word n to
             word m.  If no m is given wrd will be a single word.
             n<0 returns text starting at word abs(n) to string end
             If n is out of range then a null string is returned.
             See also nwrds.

       Ray Sterner,  6 Jan, 1985.
       R. Sterner, Fall 1989 --- converted to SUN.
       R. Sterner, Jan 1990 --- added delimiter.
       R. Sterner, 18 Mar, 1990 --- added /LAST.
       R. Sterner, 31 Jan, 1991 --- added /NOTRIM.
       R. Sterner, 20 May, 1991 --- Added common and NULL string.
       R. Sterner, 13 Dec, 1992 --- Made tabs equivalent to spaces.
       R. Sterner,  4 Jan, 1993 --- Added NWORDS keyword.
       R. Sterner, 2001 Jan 15 --- Fixed to use first element if not a scalar.
       Johns Hopkins University Applied Physics Laboratory.
 Copyright (C) 1985, Johns Hopkins University/Applied Physics Laboratory
 This software may be used, copied, or redistributed as long as it is not
 sold and this copyright notice is reproduced on each copy made.  This
 routine is provided as is without any express or implied warranties
 whatsoever.  Other limitations apply as described in the file disclaimer.txt.

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