It’s been 128 years since George Bernard Shaw penned Candida as an ironic commentary on Henrik Ibsen’s A Doll House. But the play is seldom staged, which is a pity because, as David Staller’s new adaptation shows, this 1895 feminist comedy is a gem. Staller has transported the play from the northeast suburbs of 19th-century London to Harlem in 1929. While some theatergoers might miss the British flavor of Shaw’s original text, Staller’s version brings New York grit to the drama.