Bug 17674: Allow UI to delete serials in batch

Bug 17674: Allow UI to delete serials in batch

This new feature allows for batch deletion of serials through the UI.  The current usage is a one-by-one long game.

Test plan :
- Apply patch.
- Create at least four serials with items.
- Notice that new items have a numbering pattern and a date in the enumchron field.
- Use the button Delete selected issues for the following steps.
- Delete a serial and its associated item.
- Confirm the serial and item are gone.
- Delete a serial and not its item.
- Confirm the serial is gone.
- Confirm the item is still there and the date part in the enumchron field is gone.
- Delete the two lasts serials.
- Confirm they are gone.

Sponsored-by: CCSR
Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Sonia <sonia.bouis@univ-lyon3.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>