Summary of bug description
States are connected to eachother by SmartPointer on Transitions. This results in a cyclic reference problem. StateA->Transition->StateA. 
Here ReferenceCounting by ITK can not be done properly.

Cause of the bug
During the last interaction mechanism clean-up, we descided to remove all c-pointers and replace them with SmartPointers.
The compiler didn't argue because an itkSmartPointerForwardReference was used.


Proposed solution
Don't derive mitkTransition from itk::Object and replace the SmartPointer to a Transition in mitkState with a itkWeakPointer. (Ther still will be interface changes, since itkWeakPointer has no static ::New method and so on.)
In destructor of mitk::State remove all instanciated transitions with delete.


Affected classes
mitkTransition, mitkState


How will the bugfix get tested?
mitkStateTest was removed from tests. I could not reproduce why it was removed. 
I will enable it and test the described changes.