Bug 22709: Add after biblio/item action hooks

Bug 22709: Add after biblio/item action hooks

This patch introduces after-action hooks for
- C4::Biblio::{Add|Mod|Del}Biblio
- C4::Items::{Add|Mod|Del}Biblio

After the action has taken place, a call to a helper method is done,
which loops through all plugins implementing the hooks, and calls the
plugin method. The related object is passed, along with an 'action'
string specifying the action that took place, and the object id (which
is specially important for the 'Del' case).

To test:
- Apply this patchset
- Run:
  $ kshell
 k$ prove t/db_dependent/Biblio_and_Items_plugin_hooks.t
=> SUCCESS: Tests pass!
- Sign off :-D

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>