A decade ago, Jersey City’s Little India stretch of Newark Avenue that descends rather alarmingly toward the Meadowlands swamps was really Little Gujarat. This bustling district teemed with immigrants from that far-western Indian state who patronized its temples, groceries, sari stores, restaurants, gold-dowry jewelers, and sweet shops. But gradually, their numbers dwindled. Now a fresh group of Indian immigrants, many from the southern states of Andhra Pradesh and Tamil Nadu, have replaced them, and a whole slew of new restaurants has materialized almost overnight. These places offer fascinating regional cuisines rarely glimpsed before in the New York area…..