“In life, the playwright August Wilson had an all-but-official rule: No white directors for major productions of his work” — a rule that’s been broken in a big way, albeit with his widow’s consent, with the selection of Tony winner Bartlett Sher to direct the Broadway revival of “Joe Turner’s Come and Gone.” The choice “has prompted concern and even outrage among some black directors, who say this production represents a lost opportunity for a black director, for whom few opportunities exist on Broadway or at major regional theaters.”