By James Mackenzie VATICAN CITY (Reuters) - German Chancellor Angela Merkel met Pope Francis on Saturday and, apparently responding to his criticism of a heartless "dictatorship of the economy", called for stronger regulation of financial markets. On Thursday, Francis appealed in a speech for world financial reform, saying the global economic crisis had made life worse for millions in rich and poor countries. Merkel visited Rome for a few hours specifically to meet the pontiff and spoke with him privately in his library for 45 minutes, unusually long for a private papal audience. ...