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.

src/support/cms_string_formatter.e

@@ -0,0 +1,23 @@
+note
+	description: "Format a text using arguments."
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_STRING_FORMATTER
+
+feature -- Conversion
+
+	formatted_string (a_string: READABLE_STRING_GENERAL; args: TUPLE): STRING_32
+		do
+			Result := i18n_formatter.formatted_string (a_string, args)
+		end
+
+feature {NONE} -- Implementation
+
+	i18n_formatter: I18N_STRING_FORMATTER
+		once
+			create Result
+		end
+
+end