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.

examples/demo/modules/blog/cms_blog_module.e

@@ -84,11 +84,10 @@ CREATE TABLE "blog_post_nodes"(
 
 feature -- Access: router
 
-	router (a_api: CMS_API): WSF_ROUTER
-			-- Node router.
+	setup_router (a_router: WSF_ROUTER; a_api: CMS_API)
+			-- <Precursor>
 		do
-			create Result.make (1)
-			Result.handle_with_request_methods ("/blogs/", create {WSF_URI_AGENT_HANDLER}.make (agent handle_blogs (?,?, a_api)), Result.methods_get)
+			a_router.handle_with_request_methods ("/blogs/", create {WSF_URI_AGENT_HANDLER}.make (agent handle_blogs (?,?, a_api)), a_router.methods_get)
 		end
 
 feature -- Hooks