As “Angels” gets major revivals on both coasts (and “Caroline, or Change” transfers to the West End in London), Kushner says he’s tried to get his most famous work out of his head – but he just keeps taking notes on productions, and then revising, or maybe creating a new project … about Angels. “I’m thinking of putting together a book, a user’s guide to the play, by taking all the notes and offering brief descriptions of the characters and then walking actors and directors through the entire thing.”