Signing, Singing and Speaking to Us by Linda Winer
At a distance, a musical partially for and by the deaf could be a punch line for one of Max Bialystock's creatively suicidal schemes in "The Producers."<br /> At the Roundabout Theatre Company's 42nd Street theater, however, the idea transforms a ho-hum show from 1985 into a charming, often beautiful visual and musical event. We are speaking about the pleasant revival of "Big River: The Adventures of Huckleberry Finn…