Bug 23207: Add automatic checkin feature

Bug 23207: Add automatic checkin feature

This patch adds the posibility to set an itemtype with automatic
checkin. It means that when the checkout is due, it will
automatically check in.

To test:
1. apply patches
2. updatedatabase
3. go to koha administration -> item types and edin an item type (from
   now on called itemtype1)
CHECK => there is a checkbox almost at the end called automatic checkin
4. check that checkbox and save
5. checkout 2 items from itemtype1 and one item from another itemtype
   (from now on called itemtype2)
6. go to mysql database console (koha-mysql) and manually set date_due = current_timestamp
   in issues table for the item of itemtype2 and only one of the items of
itemtype1
7. run cronjob at misc/cronjobs/automatic_checkin.pl
8. go to mysql database console again and select * from issues
SUCCESS => All issues are present except for the issue of itemtype1
which had it's date_due set to current_timestamp. That one was
automatically checked in.
9. prove t/db_dependent/Koha/Checkouts.t

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Hasina Akhter <HasinaA@pascolibraries.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>