Family Dollar (FDO) yanked investor attention to dollar store retailers Wednesday, gapping up to a 4% gain after reporting its fiscal Q4 results. Dollar Tree (DLTR) slipped 1%, Dollar General (DG) ended flat. Five Below (FIVE) added a third day to its pullback from an Oct. 1 high. Family Dollar's fiscal fourth-quarter sales and earnings just met analyst consensus forecasts. But the chain expanded at a blistering pace during the quarter, opening