SANGER, Calif. - The deep freeze that has destroyed some $1 billion worth of California citrus could also mean months of unemployment for thousands of farmworkers, packers and truck drivers during what is already a lean season for those who work in agriculture, industry officials say. ADVERTISEMENT The bad news was already trickling in Wednesday at Harris Farms, a 7,000-acre operation about 25 miles east of Fresno. "All of my sisters-in-law, my mother-in-law and my brother-in-law just got laid off from the packing sheds," said Valentino Mexicano, a ranch hand whose family of five lives in nearby Sanger. He and...