Let’s get the obvious part out of the way: this version of Oklahoma! A Broadway transfer, Daniel Fish’s reimagining of the Rodgers and Hammerstein classic quickly forgoes the knee-slapping, square-dancing bonhomie associated with the early 1900s-set musical. Things start nicely enough: Curly strides onto the stage, guitar in hand, and begins with the comforting and familiar tune of “Oh, What …