PETRINI SHIFTING FOCUS TO FRESH AND UPSCALE

SAN RAFAEL, Calif. -- Fresh foods are taking over at Petrini Markets here.In a move to redefine its image, Petrini's is dumping many of its nonfood lines to make way for more fresh and upscale foods.The company, which operates 18 stores in the San Francisco Bay area, is abandoning such nonfood lines as cigarettes, batteries, film, greeting cards, maps, postage stamps and paperback books.It's shifting