Bug 12461 - Add patron clubs feature

Bug 12461 - Add patron clubs feature

This features would add the ability to create clubs which patrons may be
enrolled in. It would be particularly useful for tracking summer reading
programs, book clubs and other such clubs.

Test Plan:
1) Apply this patch
2) Run updatedatabase.pl
3) Ensure your staff user has the new 'Patron clubs' permissions
4) Under the tools menu, click the "Patron clubs" link
5) Create a new club template
   * Here you can add fields that can be filled out at the time
     a new club is created based on the template, or a new enrollment
     is created for a given club based on the template.
6) Create a new club based on that template
7) Attempt to enroll a patron in that club
8) Create a club with email required set
9) Attempt to enroll a patron without an email address in that club
10) Create a club that is enrollable from the OPAC
11) Attempt to enroll a patron in that club
12) Attempt to cancel a club enrollment from the OPAC
13) Attempt to cancel a club enrollment from the staff interface

Followed test plan, works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>