[ticket/12787] Allow the route to say that the referer has to be used.
* Nicofuma/ticket/12787:
[ticket/12787] Updates phpbb_mock_controller_helper
[ticket/12787] Add controller_helper::get_current_url()
[ticket/12787] Remove one app.php when it's both in $path and $web_root_path
[ticket/12787] Fix the absolute board url
[ticket/12787] Use a parameter (_referer) instead of the Referer header
[ticket/12099] Add unit tests for get_web_root_path_from_ajax_referer()
[ticket/12099] Remove config again
[ticket/12099] Correctly fix the path when performing AJAX requests
[ticket/12099] Add request argument to path_helper service