Jez Butterworth’s “The Ferryman” is an ecstatic and richly thrillingly new play about the intimate, domestic effects of “The Troubles” on one large, Irish family; a sprawling epic with a 22 person cast and running time over three hours, “The Ferryman” is a titanic dramatic achievement, and a must-see event of the season.  In short: a masterpiece without present peer on Broadway.