DBXVAL

       Quickly return a value of the specified item number

       Procedure to quickly return a value of the specified item number
       from the entry.

       result = dbxval( entry, idltype, nvalues, sbyte, nbytes )

       entry - entry or entries from data base (bytarr)
       idltype - idl data type (obtained with db_item_info)
       nvalues - number of values to return (obtained with db_item)
       sbyte - starting byte in the entry (obtained with db_item)
       nbytes - number of bytes (needed only for string type)
                       (obtained with db_item)

       function value is value of the specified item in entry

       bswap - If set, then IEEE_TO_HOST is called.

       To increase speed the routine assumes that entry and item are
       valid and that the data base is already opened using dbopen.

       version 0  D. Lindler Nov. 1987  (for new db format)
       Version 1, William Thompson, GSFC, 28 March 1994.
                       Incorporated into CDS library.
       Version 2, Richard Schwartz, GSFC/SDAC, 23 August 1996
                       Allowed Entry to have 2 dimensions
       Version 2.1, 22 Feb 1997, JK Feggans,
                               avoid reform for strings arrays.
       Version 2.2     Use overwrite with REFORM(),  W. Landsman,  May 1997
       Converted to IDL V5.0   W. Landsman   September 1997
       Work for multiple-valued strings   W. Landsman   October 2000
       Add new 64bit & unsigned integer datatypes W.Landsman   July 2001
       Version 3, 2-May-2003, JK Feggans/Sigma, W.T. Thompson
           Added BSWAP keyword to avoid floating errors on some platforms.

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