Improved node management.

- List node by node types
- fixed the trash/restore/delete workflow
Added messaging module to send message to cms users (by email for now).
Added early protection for cache, export and import functionalities.

modules/node/cms_node_api.e

@@ -153,6 +153,11 @@ feature -- Access: Node
 			Result := node_storage.nodes_count
 		end
 
+	nodes_of_type_count (a_content_type: CMS_CONTENT_TYPE): NATURAL_64
+		do
+			Result := node_storage.nodes_of_type_count (a_content_type)
+		end
+
 	nodes: LIST [CMS_NODE]
 			-- List of nodes.
 		do
@@ -179,6 +184,12 @@ feature -- Access: Node
 			Result := node_storage.recent_nodes (params.offset.to_integer_32, params.size.to_integer_32)
 		end
 
+	recent_nodes_of_type (a_content_type: CMS_CONTENT_TYPE; params: CMS_DATA_QUERY_PARAMETERS): ITERABLE [CMS_NODE]
+			-- Most recent `a_content_type` nodes according to `params.offset' and `params.size'.
+		do
+			Result := node_storage.recent_nodes_of_type (a_content_type, params.offset.to_integer_32, params.size.to_integer_32)
+		end
+
 	recent_node_changes_before (params: CMS_DATA_QUERY_PARAMETERS; a_date: DATE_TIME): ITERABLE [CMS_NODE]
 			-- List of recent changes, before `a_date', according to `params' settings.
 		do