Young alcoholics offer advice By Peter DePaolo, 15, Izaak Hayes, 14B arney Gumble, a regular character on the TV series "The Simpsons," is a stereotypical portrait of an alcoholic: middle-aged, obese, disheveled -- and drunk most of the time. But as a child, Barney had a bright future. Intelligent and studious, he was on track to attend a prestigious college until he met Homer Simpson, who introduced him to cigarettes and alcohol. Barney's fictional situation is