Libyan strongman Moammar Gadhafi challenged the allies' no-fly zone for the first time today, sending up a warplane over the city of Misrata where it was quickly shot down by French fighter jets, a senior French military official said.The plane launched by Gadhafi was a "galeb," a single-engine military aircraft.Africa Command's Gen. Carter F. Ham told ABC News Gadhafi's forces are advancing in the northwest city of Misrata, with his men dressing as civilians. Ham said there are still plenty of command and control centers left for the allied forces to target.Gadhafi is aware there will be a transfer of...