an object has been created. I slightly change this behaviour. Now, during the life time of an object (when
the reference count is > 0) we keep the place where the object was created and just before freeing the object
we set the location where the object get destroyed. So when we try to release an already destroyed object
we have the location where it happens (where the object get destroyed for the first time).
This commit was SVN r6428.
