From Moby Dick, at the BAM Howard Gilman Opera House. Photo: Julieta Cervantes Moby-Dick as a rock musical in 100 minutes? It’s the kind of proposition that suggests parody rather than serious-minded adaptation. Then again, it just might be the brainchild of one of the most serious theatermakers of the last century, exhibiting his characteristic genius for contrasts: expansion and brevity, nightmarish darkness and blinding light, turbulence and tenderness. When the director Robert Wilson died