SHARM EL-SHEIKH, Egypt, Nov 14 (Reuters Breakingviews) – When John Major was Britain’s prime minister, he asked Boris Yeltsin how the Russian economy was doing “in one word”. Yeltsin, then Russia’s president, replied: “good”. Major asked him to elaborate in two words. “Not good”, Yeltsin quipped. As the leaders of the Group of 20 large economies gather in Indonesia this week, it is tempting to give a similar assessment of the state of the world. In one word, things are “hellish”. In two, though, they are “not hellish”. There are many negatives: a frying planet, a global economic crisis, conflict…