SANTA ANA, Calif. — New and expanded sections to cover business, automobiles and food. A nearly five-fold increase in community news pages and more investigative reporting. Even daily color comics. It feels like a throwback to an earlier era at the Orange County Register, where a first-time newspaper owner is defying conventional wisdom by spending heavily to expand the printed edition and playing down digital formats. Aaron Kushner added about 75 journalists and, with 25 more coming, will have expanded the newsroom by half since his investment group bought the nation’s 20th-largest newspaper by circulation in July. Changes also include …