Better-than-expected jobs and third-quarter GDP reports cheered the stock market Thursday. The Dow jumped 2%, the Nasdaq 1.8%, the S&P 500 2.3% and the NYSE composite 2.8%. But volume was softer across the board. SXC Health Solutions (SXCI) climbed 2.43 to 46.59, regaining its 50-day moving average. SXC reports earnings on Nov. 5. Medifast (MED) roared back and gained 3.46 to 23.12 after several days of high-volume selling. Before the open, the