PROVINCETOWN — The return of public sailing trips on the Kalmar Nyckel, a tall ship based in Delaware, after a five-year hiatus has revealed a pent-up demand for time aboard the replica colonial-era vessel. Its entire two-week stay here, which includes 15 public trips, sold out within hours of its arrival on July 31 — something that had never happened in its 21-year history of making port calls to Provincetown.