You have to be in the New York area to catch this on Thirteen, or visit its website for clips and further information. But this second entry in WNET-Ch. 13’s series of historical specials about its own history is just as good as the first. The highlights in this 90-minute special, and there are many, include The Great American Dream Machine, Bill Moyers’ Journal, Watergate, Dick Cavett, The Police Tapes, and An American Family. Not mentioned, and sorely missed, are Woody Allen’