Make set_attractor public, refactor
Make set_attractor public, refactor

newlawrence/poliastro,Juanlu001/poliastro,anhiga/poliastro,poliastro/poliastro,Juanlu001/poliastro,newlawrence/poliastro,Juanlu001/poliastro,anhiga/poliastro,anhiga/poliastro,newlawrence/poliastro