Bug 13773: add stock number to details and items display

Bug 13773: add stock number to details and items display

This patch adds stocknumber (named Inventory number in interface)
to details table and items display if it exists.

Test scenario:
1. find item(s) which have inventory number assigned
2. verify that you don't see inventory number in items display
3. apply this patch
4. verify that inventory number is now available

Signed-off-by: Nicole <nicole@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>