Though director Tracy Young's retelling of "The Imaginary Invalid" is as radical an adaptation as last year's "The Taming of the Shrew," it has a more lowbrow sensibility meant to evoke the commedia dell'arte -- the Punch and Judy people's theater of Moliere's time. What does that look like on the contemporary stage? Sight gags about leeches, suppositories and hypodermics (a 4-foot-long Wile E.