Bug 29277: Replace the use of jQueryUI tabs on item circulation alerts page

Bug 29277: Replace the use of jQueryUI tabs on item circulation alerts page

This patch replaces jQueryUI tabs on the item circulation alerts page as
a simple example to start the process of switching how we implement
tabbed interfaces.

The patch bumps the Bootstrap version from 3.3.7 to 3.4.1 and adds the
tabs component.

To test, apply the patch and rebuild the staff interface CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client).

- Go to Administration -> Item circulation alerts.
- Confirm that the "Checkout" and "Check-in" tabs look correct and work
  correctly.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>