function peopleaggregator_editUserRelation($args)
{
    $token = $args['authToken'];
    $dest_login = $args['login'];
    $rel_type_id = Relation::lookup_relation_type_id($args['relation']);
    $user = User::from_auth_token($token);
    $dest_user = new User();
    $dest_user->load($dest_login);
    // make sure there is a relation, and fail if not
    Relation::get_relation($user->user_id, $dest_user->user_id);
    // now make the change
    Relation::add_relation($user->user_id, $dest_user->user_id, $rel_type_id);
    return array('success' => TRUE, 'msg' => 'Edited relation');
}