Just when twenty-first-century New York has all but erased its louche past-dives, burlesque halls, raffish markets, and public spectacles-with well-mannered parks, high-rise condominiums, and corporately branded entertainment venues, the New-York Historical Society has resurrected it in Swing Time: Reginald Marsh and Thirties New York. It’s nice to have the old New York back. Marsh was born far above the city’s …