MSC: Support stopped instances to be created again

If I do another Create after the stop, it messes things up :

Yes, in fact it's the whole purpose of this "dynamic instance creation".
After the instance is deleted it is just "reset", so that it can be re-activated later

Note:
The standard says:

The stop at the end of an instance represents the termination of this instance. Dynamically there can be only one stop event in the life of an instance and no events may take place after the instance stop.

So this feature might never be implemented