MEXICO CITY (Reuters) - If supporters and opponents of Mexican President Andres Manuel Lopez Obrador can agree on anything, it's that he is very stubborn. He says so himself.Rarely during his 16 months in power has the leftist dug his heels in more than when insisting he will not spend his way out of the economic bind the coronavirus crisis has put Mexico in.The debate has plunged his relations with business leaders to their lowest ebb, as even some allies urge him to relax his grip on the..