There are probably few things in this world that mean immortality more than having your face plastered on the side of a fast-food box. That's what's happening this weekend for Houston's Joey, Robert and Steven Clark when they're inducted into the Krystal burger Hall of Fame. (Krystal burgers are the White Castle of the South.)Past inductees have included a former .38 Special guitarist and a member of the Corsairs, (apparently) widely known on the Renaissance circuit for its Irish tunes. Cl