This patch adds Koha::TrackedLink(s) classes based on Koha::Object(s)
and then adds the relationship accessor to Koha::Item and uses it within
the move_to_biblio method.
Tests for new relationship also added to t/db_dependent/Koha/Item.t
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Martin Renvoize