Bug #4489 : After moving a node, the path to the resulting node is incorrectly displayed in a publication.
Fixing the path of the moved node by simplifying the level calculation of node used during move.

Conflicts:
	ejb-core/node/src/main/java/com/stratelia/webactiv/util/node/control/NodeBmEJB.java
Bug #4489: when moving a Document to itself avoiding exceptions