(Reuters) - Outside the impenetrable walls of Muammar Gaddafi's compound in Tripoli, fuel shortages and endless queues are compounding an atmosphere of gloom in a city already worn out by weeks of conflict.Rebel forces are advancing fast toward Gaddafi's biggest stronghold, and ordinary people in the capital -- regardless of their political views -- are fearful of what is to come.(SCROLL DOWN FOR LIVE UPDATES)Read More... More on Tripoli