What's new and/or interesting in Philly theaters this weekend. Amazing Grace - The tagline ("Behind the song you love is a story you will never forget.") is absolutely awful, but the movie sounds like it might actually be pretty interesting. It's directed by Michael Apted, written by Steven Knight, and tells the true story (dramatized, of course) of the life of William Wilberforce, a British politician who successfully wages the first modern political campaign, and......