Bug 15294: Koha::Libraries - Rewrite the admin scripts

Bug 15294: Koha::Libraries - Rewrite the admin scripts

This patch rewrites the admin/branches.pl script to use the new modules
instead of C4::Branches.

Test plan:
1/ Create libraries using all the fields available
2/ Create groups of libraries
3/ Assign 1+ libraries to some groups
4/ Delete libraries and groups of libraries
You should not able to delete a library if items or patrons use it.
You should not able to delete a group of libraries if there are still
libraries using it.
5/ Update libraries and groups of libraries

Followed test plan, works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com