Bug 26208: Perform batch checkin/renewals serially rather than asynchronously

Bug 26208: Perform batch checkin/renewals serially rather than asynchronously

The issue here seems to be that when multiple requests hit at once they may not register that the renewal
performed by the request should lift restrictions on the account.

To mitigate this we can simply perform the renewals one after the other.

To test:
1 - have multiple overdue items on one patron
2 - run overdues.pl with triggers set to generate a restriction
3 - renew all overdues with the Renew All button
4 - restriction is not removed even though patron no longer has overdue items
5 - Apply patch
6 - Make all items overdue again
7 - Click Renew All
8 - Items are renewed and restriction removed
9 - Checkout items to patron again (overdue or not)
10 - Click 'Select all' in checkin column
11 - Click 'Renew/Checkin selected items'
12 - Confirm checkin succeeds as before patches

Signed-off-by: Kelly McElligott <kelly@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Bug 26208: (follow-up) Remove debugging statements

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>