PARIS - Men looking smart in suits. People walking in and out of rooms, cars, and airport lounges. Icy conversations among would-be backstabbers. I'll raise my voice then you'll raise yours. Any of these sentences could summarize the new Costa-Gavras film “Le Capital," in which the head of a large European investment bank (played by France's top humorist, Gad Elmaleh) desperately clings to power as an American hedge fund