improvement of stay in connection

 - We flag the section before the "stay in", the one where we actually stay.
 - Even if we don't move in the vj, we display a origin and destination point (the same), because if we board the vj on the last stop_point it's the connection than move us. Before that the from and to was empty.

refet to: http://jira.canaltp.fr/browse/NAVITIAII-1082
"! empty()" no ?