ISARRAY

       Tests if the argument is an array.

       flag = isarray(a)

       a = variable to test.                                in

       flag = test result: 0 if not array, else non-zero.   out

       R. Sterner  20 Mar, 1986.
       Checked for undefined variables.  RES 25 Aug, 1989.
       Johns Hopkins Applied Physics Lab.
 Copyright (C) 1986, 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.
       Converted to IDL V5.0   W. Landsman   September 1997

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