go through DeletedNode implementation to make sure it's fully first class.
Adding some debugging code that throws exceptions if it detects certain kinds of races.
It can be turned off but I want to leave it on until GA. And, you'll need to start from a clean
database as the AVM schema have changed.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@4683 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
