CANADA STOCKS-TSX nears six-year high as energy shares extend rally

* TSX rises 53.87 points, or 0.37 percent, at 14,500.39 * Index jumps 1.7 percent on week * Six of 10 main index sectors advance * Gold-mining shares slip with bullion By John Tilak TORONTO, April 17 (Reuters) - Canada's main stock index reached its highest in nearly six years on Thursday after positive U.S. economic data drove gains in the price of oil, which in turn lifted shares of oil producers. The energy sector has advanced in each of the last five sessions and ad