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/persistence/sql/cms_proxy_storage_sql.e

@@ -0,0 +1,112 @@
+note
+	description: "Proxy on a {CMS_STORAGE_SQL_I} interface."
+	date: "$Date: 2015-02-13 13:08:13 +0100 (ven., 13 févr. 2015) $"
+	revision: "$Revision: 96616 $"
+
+class
+	CMS_PROXY_STORAGE_SQL
+
+inherit
+	CMS_STORAGE_SQL_I
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make (a_sql_storage: like sql_storage)
+		do
+			sql_storage := a_sql_storage
+		end
+
+	sql_storage: CMS_STORAGE_SQL_I
+
+feature -- Access
+
+	api: detachable CMS_API
+			-- Associated CMS api.
+		do
+			Result := sql_storage.api
+		end
+
+feature -- Error handler
+
+	error_handler: ERROR_HANDLER
+			-- Error handler.
+		do
+			Result := sql_storage.error_handler
+		end
+
+feature -- Execution
+
+	sql_begin_transaction
+		do
+			sql_storage.sql_begin_transaction
+		end
+
+	sql_rollback_transaction
+		do
+			sql_storage.sql_rollback_transaction
+		end
+
+	sql_commit_transaction
+		do
+			sql_storage.sql_commit_transaction
+		end
+
+	sql_post_execution
+			-- Post database execution.
+			-- note: execute after each `sql_query' and `sql_change'.
+		do
+			sql_storage.sql_post_execution
+		end
+
+feature -- Operation
+
+	sql_query (a_sql_statement: STRING; a_params: detachable STRING_TABLE [detachable ANY])
+		do
+			sql_storage.sql_query (a_sql_statement, a_params)
+		end
+
+	sql_change (a_sql_statement: STRING; a_params: detachable STRING_TABLE [detachable ANY])
+		do
+			sql_storage.sql_change (a_sql_statement, a_params)
+		end
+
+feature -- Access		
+
+	sql_rows_count: INTEGER
+			-- Number of rows for last sql execution.	
+		do
+			Result := sql_storage.sql_rows_count
+		end
+
+	sql_start
+			-- Set the cursor on first element.
+		do
+			sql_storage.sql_start
+		end
+
+	sql_after: BOOLEAN
+			-- Are there no more items to iterate over?	
+		do
+			Result := sql_storage.sql_after
+		end
+
+	sql_forth
+			-- Fetch next row from last sql execution, if any.
+		do
+			sql_storage.sql_forth
+		end
+
+	sql_valid_item_index (a_index: INTEGER): BOOLEAN
+		do
+			Result := sql_storage.sql_valid_item_index (a_index)
+		end
+
+	sql_item (a_index: INTEGER): detachable ANY
+		do
+			Result:= sql_storage.sql_item (a_index)
+		end
+
+end