DobaBJleHA CCblJlKa  'batya' B CTpyKTypy 'TreeElement'. npuroToBbTec' K o4ucTKE.
'find' method is reimplemented, a lot of useless methods were deleted, 'delete' is still undone :/
Class without 'iterator' is ready.
Tree iterator! At long last! Sequel "Iterator Two: Remove()" soon!
task with robo-harvesters
in general methods have been tested