Tonight’s repeat of a classic Comedy Hour episode is from Season 3, when Tom and Dick Smothers were experimenting with thinking almost exclusively of the new generation. Gone, basically, were the days of cross-generational guest stars, with Bette Davis and The Who on the same bill. Instead, this 1968 installment features a young comic named George Carlin, a young improv group called The Committee (with Howard Hesseman, later of WKRP in Cincinnati), and a young rock grou