TORONTO - Canada's main stock index cruised to a new record high in its first day of trading for the year, as the loonie gained ground on the U.S. dollar. The S&P/TSX composite index surged 100.86 points to 16,309.99 on Tuesday, with energy and mining shares among major advancers on the commodity-heavy index. The February crude contract was down five cents to US$60.37 per barrel. A rally late in December sent oil to its highest price since ...