Bug 27842: Update serial.biblionumber when a subscription is linked with another...

Bug 27842: Update serial.biblionumber when a subscription is linked with another record

It seems that a librarian can edit the biblionumber for a given subscription, however, when receiving serials the biblionumber is pulled from the existing serials, so all new received issues are received on the old biblionumber.

This is problematic in light of bug 21901 - you can change the biblionumber, the serials still point to the old biblionumber - and deleting the biblio deletes the serials. Additionally, the update will delete serials where this was the case

Test plan:
1 - Create a new subscription
2 - Receive an issue
3 - Edit the subscription and change the biblionumber
4 - Receive another issue
5 - SELECT biblionumber FROM serial
=> the biblionumber link must have been updated

Signed-off-by: Petro Vashchuk <stalkernoid@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>