Fixed and improved various issue in admin module (especially the Role editing which was not working as expected.)

Added CMS_MODULE.permissions to allow module to declare the potential permissions.
Added support for CMS_LINK.is_forbidden, in relation with CMS_LOCAL_LINK.permission_arguments.
Split link "username (Logout)" into 2 links "username" and "logout".
Fixed/Changed the way auth modules alter the logout link based on "(Logout)" title, by safer solution based on `location' of the link.

Fixed usage of WSF_REQUEST.path_info by using percent_encoded_path_info which is not non unicode path info to be used most of the time.
Merged CMS_REPONSE.variables and CMS_REPONSE.values .
When possible, prefer usage of CMS_RESPONSE.user instead of CMS_REQUEST_UTIL.current_user (WSF_REQUEST) whenever it is possible.
When possible, prefer usage of CMS_RESPONSE.location, rather than usage of WSF_REQUEST.(percent_encoded_)path_info .
Code cleaning.

modules/admin/handler/cms_admin_handler.e

@@ -3,7 +3,7 @@ note
 			handler for CMS admin in the CMS interface.
 
 			TODO: implement REST API.
-			]"	author: ""
+		]"	
 	date: "$Date$"
 	revision: "$Revision$"
 
@@ -11,7 +11,6 @@ class
 	CMS_ADMIN_HANDLER
 
 inherit
-
 	CMS_HANDLER
 
 	WSF_URI_HANDLER
@@ -59,7 +58,6 @@ feature -- execute
 			execute (req, res)
 		end
 
-
 feature -- HTTP Methods
 
 	do_get (req: WSF_REQUEST; res: WSF_RESPONSE)