TEST: added new tests for reorient_vector_fields
TEST: added new tests for reorient_vector_fields

nilgoyyou/dipy,sinkpoint/dipy,Messaoud-Boudjada/dipy,Messaoud-Boudjada/dipy,demianw/dipy,villalonreina/dipy,sinkpoint/dipy,villalonreina/dipy,FrancoisRheaultUS/dipy,JohnGriffiths/dipy,StongeEtienne/dipy,StongeEtienne/dipy,jyeatman/dipy,nilgoyyou/dipy,JohnGriffiths/dipy,FrancoisRheaultUS/dipy,oesteban/dipy,beni55/dipy,mdesco/dipy,demianw/dipy,beni55/dipy,matthieudumont/dipy,oesteban/dipy,rfdougherty/dipy,mdesco/dipy,jyeatman/dipy,rfdougherty/dipy,matthieudumont/dipy