Bug 33557: Add LinkerConsiderThesaurus system preference

Bug 33557: Add LinkerConsiderThesaurus system preference

Bug 30280 added the ability to use multiple thesauri for authorities in Koha.
This is a large change, and many libraries use authorities in a ess strict manner.
This patch simply adds a preference, disabled by default, to enable this new feature

To test:
1 - Find or create a record with a 650 heading, second indicator 0 (LOC)
2 - Ensure this links to an authority in your system
3 - Disable AutoCreateAuthorities, enable CatalogModuleRelink
4 - Edit the heading to second indicator 2
5 - Save, the heading does not link
6 - Apply patch, updatedatabase, restart all
7 - Edit and save record again
8 - Heading should now link to the LOC authority, despite different second indicator value for source

Signed-off-by: Phil Ringnalda <phil@chetcolibrary.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit bf7389d6014eb0bb9a9bfcffe875940177f26a01)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>