Got rid of parent member of AVMNodes. Duplicated data unnecessarily.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3136 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/avm/PlainDirectoryNodeImpl.java

@@ -89,7 +89,6 @@ class PlainDirectoryNodeImpl extends DirectoryNodeImpl implements PlainDirectory
         }
         DirectoryNode toModify = (DirectoryNode)copyOnWrite(lPath);
         toModify.putChild(name, child);
-        child.setParent(toModify);
         child.setRepository(lPath.getRepository());
         return true;
     }