In this commencement season, the now infamous “Town & Country” is graduating to the record books as Hollywood’s biggest modern-day flop. New Line’s Warren Beatty starrer leaves U.S. theaters this week after a month-long run that reaped about $6.7 million — a shadow of its reported $85 million production cost.That’s no small distinction. “Meet Joe Black,” “Battlefield Earth,” “What Planet Are You From?” — take your pick, they all topped “Town” in terms of budget-to-gross ratio. Overseas receipts, which total $500,000 from several territories, aren’t likely to salvage the film’s fortunes. Spain thus far has offered the warmest reception, accounting for more than half of the overseas total.