* TSX rises 68.56 points, or 0.54 percent, to 12,794.25 * All 10 main sectors advance * RIM up nearly 11 percent By John Tilak TORONTO, Jan 21 (Reuters) - Canada's main stock index hit its highest level in nearly 18 months on Monday, led by a jump in Research In Motion Ltd shares following a report that it could license its software. Canadian stocks also benefited from news on Friday that U.S. House Republican leaders said they would seek to pass a three-month extension of f