DB_ITEM_INFO

       routine to return information on selected item(s) in the opened
       data bases.

       result = db_item_info( request, itnums)

       request - string giving the requested information.
               'name'          - item names
               'idltype'       - IDL data type (integers)
                                 see documentation of intrinsic SIZE funtion
               'nvalues'       - vector item length (1 for scalar)
               'sbyte'         - starting byte in .dbf record (use bytepos
                                 to get starting byte in record returned by
                                 dbrd)
               'nbytes'        - bytes per data value
               'index'         - index types
               'description'   - description of the item
               'pflag'         - pointer item flags
               'pointer'       - data bases the items point to
               'format'        - print formats
               'flen'          - print field length
               'headers'       - print headers
               'bytepos'       - starting byte in dbrd record for the items
               'dbnumber'      - number of the opened data base
               'pnumber'       - number of db it points to (if the db is
                                       opened)
               'itemnumber'    - item number in the file
       itnums -(optional) Item numbers.  If not supplied info on all items
               are returned.

       Requested information is returned as a vector.  Its type depends
       on the item requested.

       version 1  D. Lindler  Nov. 1987
       Converted to IDL V5.0   W. Landsman   September 1997

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