LIMA( Reuters)-Peru's President Pedro Castillo swore in Mirtha Vasquez, a left-wing former head of Congress, as prime minister on Wednesday, replacing her predecessor who resigned after two months in the job, as the administration grapples with political instability.... She is a lawyer and defended Maxima Acuna, a peasant farmer, in a prominent case against Newmont Mining Corp's Yanacocha gold mine that drew headlines around the world.... Financial markets are widely expected to react to the n