PARIS (Reuters) - French President Nicolas Sarkozy backpedalled from a denial and acknowledged on Wednesday that he had discussions with Muammar Gaddafi about selling a nuclear reactor to Libya some four years before Paris helped topple the late dictator in 2011. France's readiness to provide a reactor to Gaddafi's Libya has become a hot issue ahead of the election, eclipsing Sarkozy's key role in helping drive the dictator from power last year, which he frequently portrays as one of his achievements. ...