Added ranksums method so scipy is not required anymore.
Added ranksums method so scipy is not required anymore.

NDManh/numbbo,NDManh/numbbo,oaelhara/numbbo,oaelhara/numbbo,dtusar/coco,NDManh/numbbo,NDManh/numbbo,oaelhara/numbbo,dtusar/coco,dtusar/coco,NDManh/numbbo,oaelhara/numbbo,NDManh/numbbo,NDManh/numbbo,dtusar/coco,dtusar/coco,NDManh/numbbo,oaelhara/numbbo,oaelhara/numbbo,dtusar/coco,dtusar/coco,NDManh/numbbo,dtusar/coco,oaelhara/numbbo,oaelhara/numbbo,oaelhara/numbbo,dtusar/coco