Bug 17171: Add a syspref to allow currently issued items to be issued to a new patron...

Bug 17171: Add a syspref to allow currently issued items to be issued to a new patron without staff confirmation

Some libraries don't want to force the librarians to manually confirm
each checkout when the item is checked out to another. Instead, they
would prefer to be alerted after the fact.

Test Plan:
1) Apply this patch
2) Run updatedatabase.pl
3) Enable the new syspref AutoReturnCheckedOutItems
4) Check an item out to a patron
5) Check the same item out to another patron
6) Note you are not prompted to confirm the checkout,
   but are instead alerted that is had been checked out to another patron!

Signed-off-by: Christopher Brannon <cbrannon@cdalibrary.org>
Signed-off-by: BWS Sandboxes <ByWaterSandboxes@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>