ABSCAL

       Apply the FITS BZERO and BSCALE keyword values to a data array

       RESULT = ABSCAL( Value, Header, /DEBUG)

       VALUE -  Any scalar, vector, or array (usually an integer type giving a
               relative intensity).
       HEADER - A FITS  header array containing the absolute calibration
               keyword BSCALE, and optionally BZERO and BUNIT.

       RESULT = BSCALE*VALUE + BZERO, where the BSCALE and BZERO scalars
               are taken from the FITS header.
               If the absolute calibration keywords do not exist, then
               RESULT = VALUE, and !ERR = -1.

       /DEBUG - If DEBUG is set, then ABSCAL will print the
               calibration units given by the BUNIT keyword.

       Written W. Landsman, STX Corporation     January 1987
       Use DEBUG keyword instead of !DEBUG      September 1995
       Converted to IDL V5.0   W. Landsman   September 1997

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