* Split implementation
* Group implementation
* Reset cache for created object after saving
* A litle fix
* API methods definitions
* Typos
* API methods annotations.Statistics() and annotationsclear()
* Object selection
* Little fix
* Comments and docs a little changed
* Increase/decrease ZOrder
* ZOrder up/down
* Some crutial bugs fixed
* hasUnsavedChanges and merge
* Added API description
* Fixed bugs
* Merge was tested
* New file
* Fixed unit tests
* Fixed small bug which reproduced only after build