Bug 13778: Putting patron lists buttons into a dropdown menu

Bug 13778: Putting patron lists buttons into a dropdown menu

To test:
1) Go to Tools -> Patron lists
2) If there are no lists, confirm there is a message box saying 'There are no patron lists.'
3) Create a list if you do not already have one.
4) Confirm that in the 'Actions' drop down menu next to the list, the options to 'Add patrons',
   'Edit', 'Delete', and 'Print patron cards' are all there and work as expected.

Sponsored-by: Catalyst IT
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com