default constructor. Minor mods to the mapping file to fix my self made difficulty. AVMNodeFactory
now does the right thing with hibernate proxies. Test now extends to creating a file in
a directory in a repository.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@2928 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261