By Tassilo Hummel, Michel Rose and Ingrid Melander PARIS (Reuters) – French President Emmanuel Macron and far-right challenger Marine Le Pen clashed in a heated debate on Wednesday over who would be best placed to improve voters’ purchasing power and run France’s foreign policy, in their only debate before Sunday’s election. For Le Pen, who lags Macron in voter surveys, the much awaited confrontation is a chance to persuade voters she has the stature to be president and they should not fear seeing the far-right in power. “I will make it my absolute priority over the next five years to give the…