Auth_Controller is now able to display a better message if the user is unauthorized

This message contains:
- the name of the called controller
- the name of the called method of the called controller
- all the possible permissions and related modes needed to acces to this content

application/core/APIv1_Controller.php

@@ -25,7 +25,7 @@ class APIv1_Controller extends REST_Controller
 	/**
 	 * Checks if the caller is allowed to access to this content with the given permissions
 	 * If it is not allowed will set the HTTP header with code 401
-	 * Wrapper for _checkPermissions
+	 * Wrapper for permissionlib->isEntitled
 	 */
 	private function _isAllowed($requiredPermissions)
 	{