By John Tilak TORONTO (Reuters) - Canada's main stock index was little changed on Monday after a deal aimed at restricting Iran's nuclear program boosted the financial sector but weighed on natural resource shares. Also stirring the market, BlackBerry Ltd shares jumped after the company announced another shakeup in the executive suite. Much of the focus, though, stayed on the breakthrough accord that was announced Sunday between Iran and six major world powers, and its aftermath, with U.S. ...



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