CANADA STOCKS-Strong Chinese data helps TSX advance

* TSX up 21.01 points, or 0.17 pct, at 12,217.81 * Nine of 10 sectors positive; materials slip By Claire Sibonney TORONTO, Nov 12 (Reuters) - Canada's main stock index rose modestly on Monday as encouraging Chinese economic data helped to offset concerns about the possibility of a fiscal crisis in the United States and a delay in aid for Greece. Data showed Chinese exports picked up sharply in October, signaling the giant economy was gathering strength, which reassured markets a