The San Francisco world of restaurant gossip columnists went head over heels when Grace-Ann Walden retired from the Chronicle and the Inside Scoop column. She had all the info, friends in all dining rooms, ears in all the kitchens, she was our go-to-writer every Wednesday for all the tips on new restaurant openings, closures, chef musical chairs and overall juicy gossip. Who was going to dish it to us? We are thankful that Marcia’s Tablehopper......