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/hibernate/AVM.hbm.xml

@@ -45,6 +45,12 @@
 		<!-- ACL -->
 		<many-to-one name="acl" column="acl_id" 
 			class="org.alfresco.repo.domain.hibernate.DbAccessControlListImpl"/>
+		<!-- Deleted nodes -->
+		<subclass name="DeletedNodeImpl"
+			  proxy="DeletedNode"
+			  lazy="true"
+			  discriminator-value="deletednode">
+		</subclass>
 		<!-- Directories, two flavors. -->
 		<subclass name="DirectoryNodeImpl" 
 		          proxy="DirectoryNode" 
@@ -141,15 +147,6 @@
 		<many-to-one name="child" column="child_id" class="AVMNodeImpl"
 			not-null="true"/>
 	</class>
-	<class table="avm_deleted_children" name="DeletedChildImpl" proxy="DeletedChild">
-	    <cache usage="read-write"/>
-	    <id name="id" column="id" type="long">
-	    	<generator class="native"/>
-	    </id>
-		<property name="name" column="name" type="string" index="deleted_child_name_index"/>
-		<many-to-one name="parent" class="LayeredDirectoryNodeImpl"
-				column="parent_id"/>
-	</class>
 	<class name="HistoryLinkImpl" proxy="HistoryLink" table="avm_history_links">
 		<composite-id>
 			<key-many-to-one name="ancestor" class="AVMNodeImpl" column="ancestor"/>
@@ -280,26 +277,6 @@
     		v.avmStore = :store and v.versionID = :version
     ]]>
     </query>
-    <query name="DeletedChild.ByNameParent">
-    <![CDATA[
-    	from DeletedChildImpl dc
-    	where
-    		dc.parent = :parent and dc.name = :name
-    ]]>
-    </query>
-    <query name="DeletedChild.ByParent">
-    <![CDATA[
-        from DeletedChildImpl dc
-        where 
-        	dc.parent = :parent
-    ]]>
-    </query>
-    <query name="DeletedChild.DeleteByParent">
-    <![CDATA[
-    	delete DeletedChildImpl dc
-    	where dc.parent = :parent
-    ]]>
-    </query>
     <query name="FindOrphans">
     <![CDATA[
 		from AVMNodeImpl an