Fixed crash on startup with vtk6+qt5. All cloud viewers in QDockWidget are now created manually instead of being defined in the *.ui files. The generated ui didn't pass the top level parent window to constructor of CloudViewer, which caused a problem when initializing the QVTKWidget.

tools/DatabaseViewer/main.cpp

@@ -51,6 +51,7 @@ int main(int argc, char * argv[])
 
 	delete mainWindow;
 	delete app;
+	UINFO("All done! closing...");
 
 	return 0;
 }