Don't be surprised if you see AMC Networks and BBC America collaborating on digital projects, films, or events following AMC's agreement to pay $200 million in cash for a 49.9% stake in the service. “Because the editorial alignment and point of view is so similar in terms of smart, quality and premium, we think that we will find lots and lots and lots of places to join on things that we are not yet doing today,” AMC chief Josh Sapan tells me. There will be changes at BBC…