Preserve record order of subfields for authority heading extraction

When extracting headings from authority records we currently read the
subfields of a tag in configuration order.  We should, instead, read
them in record order, to preserve the desired sorting properties that
the cataloger has encoded in the record.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Yamil Suarez <yamil@yamil.com>
Upgrade script for file-order authority subfields

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Dan Wells <dbw2@calvin.edu>
Stamping upgrade script for file-order authority subfields

And fixing a small typo.

Signed-off-by: Dan Wells <dbw2@calvin.edu>