/toggle_action
action toggles poll between closed and open

Sourcecode in Poll/actions.js:
1:   function toggle_action() {
2:      var closed = !this.closed;
3:      this.closed = closed ? 1 : 0;
4:      this.modifytime = new Date();
5:      res.redirect(this._parent.href());
6:      return;
7:   }