CANADA STOCKS-TSX posts 4th day of gains on oil price rise, ECB plans

* TSX up 209.94 points, or 1.46 percent, at 14,547.71 * All of the 10 main index sectors advance * CP Rail climbs after reporting quarterly results By John Tilak TORONTO, Oct 21 (Reuters) - Canada's main stock index recorded its fourth straight session of gains on Tuesday with higher oil prices lifting shares of energy producers and the likelihood of new European Central Bank stimulus measures bolstering sentiment. The ECB is considering buying corporate bonds on the second