PURWOBINAGUN, Indonesia (Reuters) - Dozens of Indonesian villagers returned to their homes on the slopes of Mount Merapi briefly on Sunday despite an official order to evacuate over concerns the dangerous volcano could soon erupt. Indonesia raised the alert status of Merapi to the highest level, also known as code red or danger status, on Saturday, although experts say they cannot predict when it will erupt. Thick clouds of charcoal gray smoke billowed periodically from the crater on Sunday, but there were no visible signs of hot lava flowing from Merapi, one of the most menacing volcanoes in the Pacific...