A look at some noteworthy television this week: Mr. Warmth: The Don Rickles Project (Sunday, 8:00 p.m., HBO) A look at America's favorite insult comic and last surviving member of the “Rat Pack”, the octogenarian Don Rickles from director John Landis. Everyone from Chris Rock to Bob Newhart to Clint Eastwood to Sidney Poitier talk about the comic. 1968 (Sunday, 9:00 p.m., History Channel) 1968 was a turbulent and tragic year and Tom Brokaw not......