Monday the Massachusetts Bankers Association (MBA) issued a press release announcing a major data breach at what Visa and MasterCard said was an unnamed “major retailer.”  The details were far worse than the original news, though.A security breach at an East Coast supermarket chain exposed more than 4 million card numbers and led to 1,800 cases of fraud, the Hannaford Bros. grocery chain announced Monday.Hannaford said credit and debit card numbers were stolen during the card authorization process and about