Bug 12224: (follow-up) Move button to patron column in checkins table

Bug 12224: (follow-up) Move button to patron column in checkins table

This patch moves the "Print checkin slip" out of its own column and into
the colum containing patron information. I think this makes more sense
because the slip is specific to a patron, not the individual item which
has been checked in.

Also changed: printcheckinslip function should be triggered via a class,
not a non-unique ID. The function should handle the click using
"preventDefault" rather than "return false."

To test, apply the patch and check in some items checked out to various
patrons.

- In the table of checked-in items, confirm that the "Print checkin
  slip" appears correctly in the column of patron information.
- Confirm that the button works correctly to print the correct slip for
  the associated patron.

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>