C4::Branch::GetBranchDetail retrieved library infos, it could be easily
replaced with Koha::Libraries->find

When this change needs other big changes, the unblessed method is
called, to manipulate a hashref (as before) instead of a Koha::Library
object (for instance when $library is sent to GetPreparedLetter).

Test plan:
1/ Print a basket group, the library names should be correctly
displayed.
2/ Enable emailLibrarianWhenHoldIsPlaced and place a hold, a HOLDPLACED
notice will be generated (focus on the library name)
3/ Edit a patron and change his/her library
4/ Generate the advanced notices (misc/cronjobs/advance_notices.pl) and
have a look at the generated notices
5/ Same of overdues notices
6/ Set IndependentBranches and use a non superlibrarian user to place a
hold. The "pickup at" should be correctly filled.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>