Surkov Sergey <surkovsv93@gmail.com> [Tue, 23 May 2017 16:06:29 +0300] rev 1684
remove child node from add child node menu, if max count of the same type nodes reached
Surkov Sergey <surkovsv93@gmail.com> [Thu, 18 May 2017 18:00:56 +0300] rev 1683
fix reducing groups with ordered elements