Added the opacity bit to layered directories, and a method to set it. The opacity

status is returned in AVMNodeDescriptors now. Basic test added.  Also restored
a bunch of commented out checks in a number of tests.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3257 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

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

@@ -245,4 +245,12 @@ interface Repository
      * @return The descriptor.
      */
     public RepositoryDescriptor getDescriptor();
+    
+    /**
+     * Set the opacity of a layered directory. An opaque directory hides
+     * what is pointed at by its indirection.
+     * @param path The path to the layered directory.
+     * @param opacity True is opaque; false is not.
+     */
+    public void setOpacity(String path, boolean opacity);
 }