Associated Press: It’s a hellish scene: Giant sheets of flame racing across the Gulf of Mexico as thick, black smoke billows high into the sky. This, though, is no Hollywood action movie. It’s the real-life plan to be deployed just 20 miles from the Gulf Coast in a last-ditch effort to burn up an oil spill before it could wash ashore and wreak environmental havoc. Crews late Wednesday afternoon started a test burn to see how the technique was working. Rig operator BP PLC had planned to continue …