docs: def make_owner(user):
      '''
      Makes the given user a owner and tutor.
      '''
      tutor_group, owner_group = _get_user_groups()
      user.is_staff = True
      user.is_superuser = False
      user.save()
      owner_group.user_set.add(user)
      owner_group.save()
      tutor_group.user_set.add(user)
      tutor_group.save()