Bug 35994: Add $biblio->acq_status

Bug 35994: Add $biblio->acq_status

This allows you to see quickly if a biblio has linked orders or not.
And if they are all cancelled, or some still in processing, or some
are complete (and the rest cancelled).

Test plan:
Run t/db_dependent/Koha/Biblio.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Emily Lamancusa <emily.lamancusa@montgomerycountymd.gov>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>