Photo by Justin Sullivan/Getty ImagesGetty ImagesThe underperforming energy sector has been recovering. The sector relative strength has risen from last place to number six. Since 2000, this level of improvement has led to higher prices over the next four weeks in seven of eight cases. The internal readings such as breadth are improving within the sector; the advance-decline has hit a new high. These positive developments are occurring in the bullish March-April time frame. April has brought higher prices i ...