NYT: An oil rig caught fire in the Gulf of Mexico on Thursday, forcing workers to dive overboard to escape the flames, and sending chills through a region just beginning to recover from one of the worst oil spills in history. For many, the images of smoke and flames engulfing the rig recalled the fire that sank the Deepwater Horizon rig back in April and set off an uncontrollable undersea oil leak that lasted for nearly three months. Yet despite some superficial resemblances to the …