Most people probably know little about the tiny South American nation of Guyana. In the U.S., it made headlines back in the late 1970s after an American cult leader named Jim Jones took his followers there – and more than 900 died in a murder-suicide after drinking poisoned Kool-Aid . But recently Guyana has been in the news for more positive reasons. That’s because ExxonMobil has made one of the most promising offshore oil discoveries there in decades. Yet the sudden discovery of all this cash