DBEXT_DBF

       Subroutine of DBEXT to extract values of up to 18 items from a database

       This is a subroutine of DBEXT, which is the routine a user should
       normally use.

       dbext_dbf,list,dbno,sbyte,nbytes,idltype,nval,v1,[ v2,v3,v4,v5,v6,v7,
                  v8,v9,v10,v11,v12,v13,v14,v15,v16,v17,v18 ITEM_DBNO = ]

       list - list of entry numbers to extract desired items.   It is the
               entry numbers in the primary data base unless dbno is greater
               than or equal to -1.  In that case it is the entry number in
               the specified data base.
       dbno - number of the opened db file
               if set to -1 then all data bases are included
       sbyte - starting byte in the entry.  If single data base then it must
               be the starting byte for that data base only and not the
               concatenation of db records
       nbytes - number of bytes in the entry
       idltype - idl data type of each item to be extracted
       nval - number of values per entry of each item to be extracted

       v1...v18 - the vectors of values for up to 18 items

       item_dbno - A vector of the individual database numbers for each item.
               Simplifies the code for linked databases

       DB_INFO(), DB_ITEM_INFO(), DBRD, DBXVAL(), IS_IEEE_BIG(), IEEE_TO_HOST

       version 1  D. Lindler  Nov. 1987
       Extract multiple valued entries    W. Landsman   May 1989
       William Thompson, GSFC/CDS (ARC), 1 June 1994
               Added support for external (IEEE) representation.
       Work with multiple element string items  W. Landsman  August 1995
       Increase speed for external databases on IEEE machines WBL August 1996
       IEEE conversion implemented on blocks of entries using BIG
       Added keyword ITEM_DBNO     R. Schwartz, GSFC/SDAC, August 1996
       Return a vector even if only 1 value W. Thompson  October 1996
       Change variable name of BYTESWAP to BSWAP  W. Thompson Mar 1997
       Use /OVERWRITE with reform   W. Landsman   May 1997
       Converted to IDL V5.0   W. Landsman   September 1997
       Increase maximum number of items to 18  W. Landsman  November 1999
       2 May 2003, W. Thompson, Use DBXVAL with BSWAP instead of IEEE_TO_HOST.

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