SXGPAR

       Obtain group parameter value in SDAS/FITS file

       result = sxgpar( h, par, name, [ type, sbyte, nbytes] )

       h - header returned by SXOPEN
       par - parameter block returned by SXREAD or multiple
               parameter blocks stored in array of dimension
               greater than one.
       name - parameter name (keyword PTYPEn) or integer
               parameter number.
 OPTIONAL INPUT/OUTPUT
       type - data type (if not supplied or null string, the
               header is searched for type,sbyte, and nbytes)
       sbyte - starting byte in parameter block for data
       nbytes - number of bytes in parameter block for data

       parameter value or value(s) returned as function value

       If an error occured then !err is set to -1

       Supplying type, sbyte and nbytes greatly decreases execution
       time.  The best way to get the types is on the first call
       pass undefined variables for the three parameters or set
       type = ''.  The routine will then return their values for
       use in subsequent calls.

       The parameter type for parameter n is obtained
       from PDTYPEn keyword.  If not found then DATATYPE keyword
       value is used.  If that is not found then BITPIX is
       used.  BITPIX=8, byte; BITPIX=16 integer*2; BITPIX=32
       integer*4.

       version 1  D. Lindler  Oct. 86
       version 2  D. Lindler Jan. 90  added ability to process
               multiple parameter blocks in single call
       version 3  D. Lindler  (converted to New vaxidl)
       Apr 14 1991      JKF/ACC - fixed make_array datatypes(float/double)
       Converted to IDL V5.0   W. Landsman   September 1997

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