MADRID (Reuters) - A fire described as the worst in Madrid's history has ravaged a 32-storey skyscraper in the Spanish capital's financial district, causing no injuries, but the tower stayed upright despite fears of collapse.More than 100 firefighters worked all night to try to quell the spectacular blaze in Madrid's eighth tallest building. By morning on Sunday the flames had died down but the fire was still pumping a plume of white smoke into the sky over the capital. "The fire is not under control," Madrid Mayor Alberto Ruiz Gallardon told reporters. "We are all aware that we are fighting...