LP#1879335: (follow-up) improve extraction of thesaurus

LP#1879335: (follow-up) improve extraction of thesaurus

Use the stored procedure authority.extract_thesaurus(), which knows
how to grab the thesaurus from the 040 when necessary.

This also renames the "Thesaurus" column in the display grid to
"Thesaurus (Short Code)", which corresponds to the 008 thesarus
position, and "Thesaurus Code" to "Thesaurus"

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>