“People always tell me how difficult Orson Welles is,” the great film scorer and Welles collaborator Bernard Herrmann once said, “The only people I’ve ever met worth working for were difficult people, because they’re interested in achieving something. Just spare me the charmers. Welles in every other way might be difficult, but when it comes to making artistic decisions, he’s like the Rock of Gibraltar.” 40 years after his death, Orson Welles’ f…