Added trash feature: Remove or revert a node.

Added Handler to show the current trash nodes for a given user.
An admin can see all the trash nodes.
Updated storage to handle trash and revert nodes.

modules/node/persistence/cms_node_storage_null.e

@@ -41,6 +41,12 @@ feature -- Access: node
 			create {ARRAYED_LIST [CMS_NODE]} Result.make (0)
 		end
 
+	trash_nodes (a_user_id: INTEGER_64): LIST [CMS_NODE]
+			-- List of nodes by user `a_user_id'.
+		do
+			create {ARRAYED_LIST [CMS_NODE]} Result.make (0)
+		end
+
 	recent_nodes (a_lower: INTEGER; a_count: INTEGER): LIST [CMS_NODE]
 			-- List of the `a_count' most recent nodes, starting from `a_lower'.
 		do
@@ -80,6 +86,16 @@ feature -- Node
 		do
 		end
 
+	trash_node_by_id (a_id: INTEGER_64)
+			-- <Precursor>
+		do
+		end
+
+	revert_node_by_id (a_id: INTEGER_64)
+			-- <Precursor>
+		do
+		end
+
 --	update_node_title (a_user_id: like {CMS_NODE}.id; a_node_id: like {CMS_NODE}.id; a_title: READABLE_STRING_32)
 --			-- <Precursor>
 --		do