Bug 25814: SIP: Add a message on successful checkin.

Bug 25814: SIP: Add a message on successful checkin.

Currently, Koha does not return a message on successful SIP checkin.

This patchs adds the show_checkin_message option to SIPconfig.xml, disabled by
default. When enabled, the following message is displayed on SIP checkin:

"Item checked-in: {homebranch|permanent_location} - {location}"

The UseLocationAsAQInSIP system preference is used to determine whether the
homebranch or the permanent location will be used.

Test plan:

 - Perform a successful checkin using SIP
 - Check that the message is in the checkin response (AF field)
 - prove t/db_dependent/SIP/Transaction.t

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Edit (tcohen): tidied the whole subtest.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>