bugfix concerning:
	GraphImpl.allocateVertexIndex(int currentId)
	GraphImpl.allocateEdgeIndex(int currentId)
bug: The parameter currentId was ignored. This caused a bug in the following situation:
	Edge id list: e1 te4 e5
	where temporary edge te4 with te4.id=4
The blessing of te4 performs the following actions:
1. delete te4
	Edge id list: e1 e5
2. create new edge n
	Edge id list: e1 n2 e5
	with n2.id = 2
3. set id of new edge to 4 (=te4.id)
	Edge id list: e1 n2 e5
	with n2.id = 4
4. allocate index 4 (which did not work correctly (see above))
	Edge id list: e1 n2 3 e5
	with n2.id = 4
	with 3 which has no corresponding edge
5. free index 2
	Edge id list: e1 3 e5
	with n.id = 4
Two new edges are created, which leads to the following situation:
	Edge id list: e1 e2 3 e4 e5
	with n.id = 4
Now, both edges n and e4 have the same id.