As Sunday news reports described Mexican monopolist Carlos Slim Helu's bid to become the largest shareholder of The New York Times, readers and staffers were no doubt wondering precisely what kind of scoundrel he is.Everyone knows Slim controls Telmex, the politically connected monopoly that has driven investors hoping to compete against Slim's companies out of Mexico. But news accounts haven't yet described the precise methods by which he has used his influence over government officials to grow