Bug 15883 - Upgrade jQuery from v1.7.2 in the staff client

Bug 15883 - Upgrade jQuery from v1.7.2 in the staff client

This patch updates the staff client version of jQuery to 2.2.3. In order
to maintain compatibility with existing scripts, the jQuery migrate
plugin has also been added.

Included is the development version of the jQuery migrate plugin.
Developers could modify doc-head-close.inc to use this version if they
wanted to take advantage of its upgrade warning log.

To test, apply the patch and test JavaScript interactions everywhere in
the staff client.

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher <bredan@bywatersolutions.com>