To me, books are their own type of magic, transporting us to someplace else.  When I hear an author talk about formulas, and how books just don’t happen, write themselves, open themselves to you, I find myself a bit disappointment. Joanne Harris does not disappoint. She was at the Hay Festival to talk about her newest book, “Peaches for Monsieur le Curé”, the third book in the “Chocolat” series.  She was funny and personable, and a delight to listen to. Talking with Paul Blezard, he commented that Vianne was a character that has always haunted him and wondered if she visits Harris as well. “The difference between writing and madness….is…