The Neck? South Philly swampland coveted by urban dreamers for more than a century was finally tamed for refineries, the Sports Complex, and FDR Park. The turning point: the six-year-long “pig wars” and the final end to South Philly’s agrarian history. John Vidumsky recreates the showdown with pigs as proxy for the yeoman lifestyle and an interview with one of the last surviving homesteaders