Bug 17964: TT syntax for notices - Prove that CHECKIN and CHECKOUT are compatible

Bug 17964: TT syntax for notices - Prove that CHECKIN and CHECKOUT are compatible

From the CHECKIN and CHECKOUT templates you should be able to access the
following information: item, biblio, biblioitem, patron and library

Test plan:
Define CHECKIN and CHECKOUT notice templates.
You should be able to define them using the TT syntax to produce the
same generated notice messages as with the historical syntax.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>