Handbagged, opening tonight as part of the Brits Off Broadway festival at 59E59 Theaters, bills itself as a comedy about the closed-door meetings between two extraordinarily iconic women of twentieth century Britain: Queen Elizabeth II and the "Iron Lady" Prime Minister Margaret Thatcher. The description ("a comedy"), however, barely begins to scratch the surface of the mix of satire, politics, and meta-theater of Moria Buffini's splendidly performed and well-directed play about two people who have so little in common that their weekly requisite get-togethers over an 11-year period resemble nothing less than a visit to the "hell is other people" realm depicted in Sartre's No Exit. . . .