'Loads the settings we need to deal with groups. Raises
ImproperlyConfigured if anything\'s not right.'

def _init_group_settings(self):

    self._group_type = self.settings.GROUP_TYPE
    if (self._group_type is None):
        raise ImproperlyConfigured('AUTH_LDAP_GROUP_TYPE    must    be    an    LDAPGroupType    instance.')
    self._group_search = self.settings.GROUP_SEARCH
    if (self._group_search is None):
        raise ImproperlyConfigured('AUTH_LDAP_GROUP_SEARCH    must    be    an    LDAPSearch    instance.')
