Here we are: Wonderful Town . Photo: Joan Marcus After a move toward turn-of-the-millennium musicals with Ragtime , Titanic , and Urinetown , the “Encores!” series has lately snapped back to its core mid-century mission with Love Life — Kurt Weill and Alan Jay Lerner’s curio of a concept musical from 1948 — and now the 1953 Comden-Green-Bernstein confection that is Wonderful Town . The show replaced the announced revival of Michael John LaChiusa’s The Wild Party (reportedly deferred to next