* Add dockdepth1 example
* Fix compilation (include assert.h)
* Replace dockdepth1 by dockindock
* Fix crash when dockindock example is closed. Due to code in dockindock supposed to fix memory leaks: now leaks were fixed in CDockManager (https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues/307), the code from dockindock ends up deleting objects already deleted by parent.