Added new AVM node type DeletedNode (aka, ghost, tombstone), a marker node for a

node that has been deleted in a version. This makes tree comparisons easier by
resolving the cases in which one wants to know whether a deletions is more or less 
recent than another version of a node.  Along the way got rid of DeletedChild and 
friends including a table in the schema, since DeletedNode takes on all the work
that it performed.
Deleted two illegally named files in Virgin content.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3748 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

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

@@ -446,7 +446,7 @@ public class AVMStoreImpl implements AVMStore, Serializable
         {
             throw new AVMNotFoundException("Does not exist: " + name);
         }
-        dir.removeChild(name);
+        dir.removeChild(lPath, name);
         dir.updateModTime();
     }