The Mystery of Edwin Drood ***
        A Mad Caper Finds Its Way to Broadway, Once AgainWill Chase, Stephanie J. Block            By Isa GoldbergThere is lots of faux fun to be had watching "The Mystery of Edwin Drood." A take-off on British music hall entertainment of the mid 1800s that carried on for nearly a century, this kind of humor clearly doesn't go out with a whimper…