DBINDEX_BLK

       Subroutine of DBINDEX to create associated variable of correct datatype

       DBINDEX_BLK will offset into the file by a specified amount in
       preparation for writing to the file.   V5.2 or later

       res = dbindex_blk(unit, nb, bsz, ofb, dtype)

       unit   The unit number assigned to the file.
       nb     The number of blocks to offset into the file.
       bsz    The size of each block, in bytes, to offset into the file.
       ofb    The offset into the block, in bytes.
       dtype  The IDL datatype as defined in the SIZE function

       res    The returned variable.  This is an associated variable.

       The file must have been previously opened.

       Written by Michael R. Greason, STX, 14 June 1990.
       Converted to IDL V5.0   W. Landsman   September 1997
       Use 64 bit integer for very large databases  W. Landsman February 2001
       Added new unsigned & 64bit integer datatypes    W. Landsman July 2001

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