Reuters: The discovery of huge offshore oil reserves has made Brazil one of the world’s hottest energy markets, with firms that make everything from planning software for wells to floating “hotels” for platform workers clamoring for a piece of the action. More than 35,000 people are attending this week’s Rio Oil and Gas conference, the first since state firm Petrobras shocked the oil world last November by announcing the world’s second-biggest oil find in 20 years. As financial markets …