Bug 29483: Unit tests

Bug 29483: Unit tests

This patch updates the AllowRenewalIfOtherItemsAvailable tests to
remove deletion of all data, and create specific circ rules for this
test. It adjust several other tests that were relying on the rules from
this test, so thy too create their opwn specific rules.

Additionally, we add tests to cover the case of mutliple items on the record,
and some items cannot fill some reserves.

What is uncovered here is that the same patron is checked twice, so two holds can
be filled, but they only satisfy a single patron

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>