BDS + COF
The permissions assignation is triggered by the `post_migrate` signal since the
permission table will only be populated after the migrations have been applied.
- remove is_buro from the database in the same way we did for is_cof
- make a decent migration that *SHOULD* take into account is_cof for old
databases. note, this has been tested only through unittests.
- make unittests pass again accordin=gly fixing views.
Note: we should make a method for filtering with specific group members,
something like
map(lambda x: x.profile.cof, filter… group…)
