SEASON PREMIERE: This venerable newsmagazine, the longest-running continuing series in prime time, continues to score often with significant scoops, ending up, more than not, in the end-of-week Top 10. Tonight is the start of Season 47 for 60 Minutes, and one of the ways I put that astounding run into perspective is to remember that during its first season, it did a story on The Smothers Brothers Comedy Hour, a fellow CBS show that, in 1968 when the story ran, was stirring up all kinds of trouble. During the Johnson adminstration. Almost half a century later, 60 Minutes continues to look for trouble, and troublemakers. Tonight, Scott Pelley interviews former defense secretary Leon Panetta, who explains how ISIS became a formidable force in the Middle East region – and why it shouldn’t have.