Lens finished second in Ligue 1 last season and won the Coupe de France. Building on that success is proving tricky By Get French Football News It was under cover of darkness that Yannick Cahuzac took his place in the Lens dugout at the Stade Louis II on Friday night. The lights dimmed as the players made their entrance and Cahuzac, who had been named interim manager just three days earlier, sat alone, leaning forward on a seat that Dino Toppmöller would have occupied if not for a dramatic turn…