#169 Admin on teams

* adds admin column on team index view
* refactors Team model, so multiple members can become admins
* adds team migration for switch from fkey->m2m structure
* renames 'Group' to 'Permission' on user index view to avoid confusion between 'Groups' and Teams
* adds new autocomplete route for team-admin selection based on already selected members of the TeamForm

konova/tests/test_views.py

@@ -274,7 +274,7 @@ class BaseTestCase(TestCase):
         team = Team.objects.get_or_create(
             name="Testteam",
             description="Testdescription",
-            admin=self.superuser,
+            admins__in=[self.superuser],
         )[0]
         team.users.add(self.superuser)