By Renee Maltezou and Deepa Babington ATHENS (Reuters) - Greek left-wing leader Alexis Tsipras was sworn in on Monday as the prime minister of a new hardline, anti-bailout government determined to face down international lenders and end nearly five years of tough economic measures. The decisive victory by Tsipras' Syriza in Sunday's snap election reignites fears of new financial troubles in the ...