Bug 12224: Print a slip of borrower's checkins for today

Bug 12224: Print a slip of borrower's checkins for today

To test:

1) Apply patch and run installer
2) Check out two items (or more) to a borrower
3) Check in two items (or more) for this borrower (you should end up on
    circ/returns.pl)
4) Notice the checked-in items table has started building. There should
be a new column with the button 'Print checkin slip' in each row.
5) Click the button and confirm the checkin slip opens for printing in a
new window.
6) Go to the patron's account
7) Click the Print dropdown. Confirm there is a 'Print checkin slip'
option. Click this and confirm the checkin slip opens for printing in a
new window.

Sponsored-by: Bibliotheksservice-Zentrum Baden-Württemberg (BSZ)
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Alexandra Speer <alexandra.speer@bsz-bw.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Christian Stelzenmüller <christian.stelzenmueller@bsz-bw.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>