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.

src/service/misc/cms_request_util.e

@@ -25,6 +25,7 @@ feature -- User
 
 	current_user (req: WSF_REQUEST): detachable CMS_USER
 			-- Current user or Void in case of Guest user.
+			-- note: if a CMS_RESPONSE is available, always prefer {CMS_RESPONSE}.user if relevant.
 		note
 			EIS: "eiffel:?class=AUTHENTICATION_FILTER&feature=execute"
 		do
@@ -70,4 +71,7 @@ feature -- Media Type
 			end
 		end
 
+note
+	copyright: "2011-2015, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 end