“Burn Notice,” the perfect TV show for summer, returns for its second season Thursday, July 10, on USA Network. Jeffrey Donovan stars in this lighthearted spy series, set in Miami, that is funny and smart with strong doses of action and heart. “Sun.Surf. Espionage,” as the show poster says. Tricia Helfer, one of the “Battlestar Galactica” babes, joins the cast as Donovan’s handler. Good news for discriminating viewers: “Mad Men,” AMC’s outstanding drama, which went head-to-head against “Burn Notice” last season, has switched to Sunday nights.