MEXICO CITY (Reuters) – Mexican authorities on Sunday cleared a makeshift camp in the north of the country where hundreds of migrants heading towards the U.S. border had been holding out for more than a year in what rights organizations criticized as deplorable conditions. Nearly 400 migrants have been transferred by bus to three different shelters near the border city of Tijuana, where they can remain “indefinitely,” said the city’s Mayor Montserrat Caballero. Caballero promised help for those migrants regardless of whether they want to stay in Tijuana or return to their countries of origin. …