Move event-related models from 'cof' app to 'gestion' app.
Add 'Association' model to register name, related groups (buro,
members), etc.
Club is now associated with a single Association instance.
Migrations take care of these changes.
Profile view
- Let the user see his information.
- List the clubs whose he is a member.
Profile edition view
- Renamed from previous "profile" view
- User can now change "occupation" field.
Club detail view
- Informations about a club.
- Accessible by staff members and "respos" of the club.
- List members, with subscription fee (if applicable).
Club admin
- Change memberships of clubs added.
- Nested inlines
- Limiting access to the events : you can only edit/create events linked to
associations you for which you have the `<assoc>.buro` permission.
