DUBAI (Reuters) - An Iranian official said on Wednesday that he saw an "opening" in Iran's nuclear dispute with the West, a news agency reported, in the latest signal that Tehran expects fresh movement to break a decade-old deadlock. The United States and its allies believe Iran is seeking a nuclear weapons capability, and have imposed sanctions aimed at stopping it. Iran denies it wants a bomb and says its nuclear energy program has peaceful aims. Iran and world powers have been engaged in negotiations which have so far failed to resolve the dispute. ...