If there have been more boring recent films than Benoît Jacquot’s “Last Love,” ("Dernier Amour" in the French original) none readily comes to mind. Though one must admit that it’s a feat in itself to have such rich material to deal with and to turn it into a yawn-inducing couple of hours. The last fling of the maestro of love himself, Giacomo Casanova, (and, if the script based on the Venetian adventurer’s own written story of