It’s the end of an era, and potentially the end of the world. For the first time in almost 60 years, “It’s the Great Pumpkin Charlie Brown” will not air on cable. What does this mean for other Snoopy specials that have faded into obscurity? Why does Sony Music Japan own a major chunk of the “Peanuts” Company? And just who is Wild Brain Entertainment? We only answer some of these questions. Others, we’re hoping you can answer for us.