System preferences should have a package based on Koha::Object to remove
the need for direct manipulation via SQL.
Test Plan:
1) Apply this patch
2) prove t/db_dependent/sysprefs.t
Signed-off-by: Chris Nighswonger <cnighswonger@foundations.edu>
Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>