Those young – and young at heart – can recognize his bald, round-headed silhouette almost instantly. Even more iconic is his sunshine-yellow shirt with its horizontal black zigzag. He's Charlie Brown, and this weekend he and the rest of the "Peanuts" crew will appear on stage for Fairfax High's musical, "You're a Good Man, Charlie Brown." The play is based on the classic "Peanuts" characters by Charles Schulz and presents a typical day in the life of Charlie Brown. At school, he makes a fool of