This York Theatre Company production at the New World Stages, following a presentation at Goodspeed Musicals in 2016, shoehorns these songs into a book by Lindsey Hope Pearlman from a story created by Richard J. Robin. It has an ambitious plot that glibly takes on a number of themes roiling through the turbulent Sixties:Â women's lib, civil rights, the war in Vietnam, the sexual revolution, Andy Warhol, and even a…