Robert Lepage (third from left), as the Marquis de Sade, is roundly applauded by the audience at Le Diamant at the end of Quills. He is surrounded by other members of the cast: Sophie Faucher, the wife of the Marquis; Jean-Sébastien Ouellette, the director of the asylum; Pierre-Yves Cardinal, the priest; Mary-Lee Picknell, the laundress; and Pierre-Olivier Grondin, the architect of a new manoir for the director of the asylum. (Photo by Shirley Nadeau) REVIEW: Quills at Le Diamant: The Marquis de Sade rests in pieces Shirley Nadeau shirley@qctonline.com Le Diamant theatre is currently presenting a rather sadistic play. The term “sadism” has its…