Bug 10005: Inventory - Add an option to not check in items

Bug 10005: Inventory - Add an option to not check in items

The inventory tools automatically check in items, this patch adds it as
an option.

Test plan:
1/ Check an item out, fill a file with its barcode, and use this file in
the inventory tools.
2/ Check the new checkbox and confirm that the item is not checked in
3/ Repeat again and don't check it, the behavior should be the same as before
this patch.

Signed-off-by: Jason Robb <jrobb@sekls.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Added a missing </li>.
Patch works as expected.
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>