Bug 15280: Switch default CHECKOUT notice to Template Toolkit

Bug 15280: Switch default CHECKOUT notice to Template Toolkit

Test Plan:
1) Ensure dependancies are applied
2) Apply this patch
3) Update your CHECKOUT notice to match the following:

The following items have been checked out:
----
[% biblio.title %]
----
Thank you for visiting [% branch.branchname %].

3) Generate a CHECKOUT notice for a patron
4) Note there is not change to the generated notice

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>