Added a natural-id element to mapping definition for ChildEntries.

Added two apparently necessary hibernate flushes.
Added a createSnapshot call after unzipping in ImportWebsiteDialog.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3896 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

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

@@ -445,6 +445,8 @@ class PlainDirectoryNodeImpl extends DirectoryNodeImpl implements PlainDirectory
             }
             // Get rid of the DELETED_NODE child.
             AVMContext.fgInstance.fChildEntryDAO.delete(child);
+            // Another &*#*&#$ flush.
+            AVMContext.fgInstance.fAVMNodeDAO.flush();
         }
         // Make the new entry and save.
         ChildEntry newChild = new ChildEntryImpl(name, this, node);