Later Life ****
By: Paulanne Simmons If America has its own Chekhov, it would have to be A. R. Gurney. As Chekhov, in his short career as a playwright (he died of tuberculosis at 44), illuminated and elucidated the woes of landowning Russians, Gurney in his long career (the playwright died last June at 86), has chronicled the trials and tribulations of that native American species, the WASP. And so it is with Gurney's 1993 comedy-d…