Added support for path_aliases.

Refactored CMS_MODULE.router (..): WSF_ROUTER design,
  to create only one router object of type CMS_ROUTER.
Added optional CMS_NODE.link: CMS_LOCAL_LINK
Reviewed permissions related to node module.
Refactor and add CMS_STORAGE_SQL(_BUILDER) abstractions
   for implementation relying only on SQL statements.
Factorized sql builder initialization (to work for sqlite and mysql storage builders).
Added CMS_RESPONSE.formatted_string (a_text: READABLE_STRING_GENERAL; args: TUPLE): STRING_32
Added function "translation", but not implemented for now.
Updated indexing notes and comments.
Code cleaning.

modules/node/node_module.e

@@ -109,8 +109,8 @@ feature {CMS_API} -- Access: API
 
 feature -- Access: router
 
-	router (a_api: CMS_API): WSF_ROUTER
-			-- Node router.
+	setup_router (a_router: WSF_ROUTER; a_api: CMS_API)
+			-- <Precursor>
 		local
 			l_node_api: like node_api
 		do
@@ -119,8 +119,7 @@ feature -- Access: router
 				create l_node_api.make (a_api)
 				node_api := l_node_api
 			end
-			create Result.make (2)
-			configure_web (a_api, l_node_api, Result)
+			configure_web (a_api, l_node_api, a_router)
 		end
 
 	configure_web (a_api: CMS_API; a_node_api: CMS_NODE_API; a_router: WSF_ROUTER)