Bug 15830 - Move Rotating Collections actions into a drop-down list

Bug 15830 - Move Rotating Collections actions into a drop-down list

To test:
1) Go to Tools -> Rotating Collections
2) Confirm actions (Add or remove items, Transfer, Edit, Delete) have moved into a drop down menu
3) Confirm all of the actions work as expected

Sponsored-by: Catalyst IT
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com