MOUNT AIRY- Dating Barney Fife doesn’t insulate you from crime. Nor does living in the the town that was the template for the for fictional hamlet of Mayberry. Betty Lynn, who played the bumbling deputy’s sweetheart on “The Andy Griffith Show” in the 1960s, was sitting outside a Lowes Foods store after shopping and getting money out to pay for a cab home Sunday when a man snatched her wallet with about $130 in it and ran off. Lynn is 83 but still a force to be reckoned with. “I jumped up and started yelling, ‘Thief! Thief! and ran after...