Bug 25232: Add ability to skip trapping items with a given notforloan value

Bug 25232: Add ability to skip trapping items with a given notforloan value

This is a companion/alternative to bug 25184, in that it allows an
explicit workflow for placing returned books into temporary storage for
a few days for decontamination purposes.

The idea here is to create a specific notforloan value for "In
Decontamination" or something along along those lines. This notforloan
value would never be trappable. At the end of decon,
UpdateNotForLoanStatusOnCheckin  could be used to remove the
notforloan status and allow checkins to be trapped to fill holds.

Test Plan:
1) Apply this patch
2) Restart all the things!
3) Give an item a negative notforloan value
4) Place a hold on the item
5) Check the item in
6) Note the item is trapped for hold
7) Set SkipHoldTrapOnNotForLoanValue to the same notforloan value
   you used in step 3
8) Check the item in again
9) Note Koha did not ask you to trap the item for hold!

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>