By Michel Rose PARIS (Reuters) – The French will decide on April 24 whether to re-elect pro-business centrist President Emmanuel Macron or blow up decades of mainstream consensus in favour of far-right Marine Le Pen. Here’s what to expect from them on major issues: \- THE ECONOMY: LE PEN: The far-right heiress has transformed the former National Front, turning her father’s free-market, small-government party into a big-spending, protectionist one. She wants to implement a “Buy French” policy for public tenders, cut the minimum retirement age to 60 for those who started work before 20, scrap in…