Bug 7910: Add the ability to renew several subscriptions at once

Bug 7910: Add the ability to renew several subscriptions at once

This patch adds a "Renew all selected subscriptions" action link on top
of the table of the "Check expiration" page.

It will allow to auto-renew several subscriptions.

Test plan:
Make sure this new link renew the selected subscriptions as expected.

Sponsored-by: BULAC - http://www.bulac.fr/
Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>