Ani DiFranco is a longtime denizen of the music industry’s DIY underworld. She shuffles the set list, freshens the storytelling and shapes the performance to the venue, whether it’s a crusty dive bar or a soft-seater theater. When she was touring with drummer Andy Stochansky years ago, she would rather stroll onstage in a flannel shirt, sniff the air and ponder the question, “What’s tonight about