A few years ago, France’s most successful living director (Luc Besson) announced his intention to quit while he was ahead. He would, he said, make 10 films and then get out of the game. At the time few people took him seriously. But with “Angel-A” and “Arthur and the Minimoys,” he has reached his limit. He says cinema is a young art form and he has now outgrown it. “Ten is a good number,” he explains. “If you have 10 bullets you are much more careful about what you shoot. And I would rather stop too soon than too late. I’ve seen so many directors make a few too many films, and it’s sad.” Xan Brooks reports.