As oil prices climbed above $68 Tuesday for the first time since December, analysts at some of the world’s biggest banks were holding onto views that this would be a bad year for crude — just not as terrible as they originally predicted. Rather then extending last year’s losses, Brent, the global benchmark, has rallied about 50 percent from a six-year low in January as demand accelerated and the rapid growth in supplies started to slow. The rebound is a shock. At the start of 2015, Bank of America Corp., Barclays Plc and Goldman Sachs Group Inc. all predicted that oil might collapse to about $30 a barrel. Now, though, they are raising their price estimates while remaining […]