At 40,000 1/2 feet, the imposing Rum Doodle is the highest mountain in the world, surpassing even Mount Everest, its alpine neighbor on the Himalayas. Surmounted only by a group of audacious British mountaineers and their Yogastani porters in an odyssey fraught with misadventure, its ascent is the stuff of which mountaineering legends are made. As if scaling the perilous…