Treasuries jumped Thursday after disappointing data cast doubts on the pace of economic recovery and a solid 30-year bond auction helped revive the appetite for safe-haven government debt. Fueling the rally was a safety bid stemming from credit problems facing California and Greece, analysts said. "The data have become shakier, and these auctions continue to go well," said Lou Brien, a market strategist at DRW Trading. A surprise 0.3% drop in