Anchorage Daily News: For many years, a Native family suspected a major oil company was shortchanging them for using a strategic piece of North Slope land to pump billions of dollars worth of oil. The company, BP, as well as the federal agency that oversees Indian land holdings, had long rejected the claims of the heirs of Andrew Oenga, an Inupiat who held the 40-acre allotment on the edge of the rich Prudhoe Bay oil field. Recently, however, the family struck what could be a costly blow against …