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/node/handler/node_response.e

@@ -10,8 +10,6 @@ inherit
 	CMS_RESPONSE
 		rename
 			make as make_response
-		redefine
-			custom_prepare
 		end
 
 feature {NONE} -- Initialization
@@ -27,15 +25,6 @@ feature -- Access
 	node_api: CMS_NODE_API
 			-- Associated node API.
 
-feature -- Generation
-
-	custom_prepare (page: CMS_HTML_PAGE)
-		do
-			if attached variables as l_variables then
-				across l_variables as c loop page.register_variable (c.item, c.key) end
-			end
-		end
-
 feature -- Helpers
 
 	node_id_path_parameter (req: WSF_REQUEST): INTEGER_64