“Manahatta” dramatizes two pivotal, and shameful, moments in New York City history, occurring four centuries apart — the Dutch West India Company’s “purchase” of the island of Manhattan from the Lenape Indians (who had no concept of land ownership), and the world-wide financial crisis of 2008, In Mary Kathryn Nagle’s sharply written play, which is wonderfully acted under Laurie Woolery’s seamless direction, the two events tell much the same story.