remove reordering of the eigenvalues-eigenvector since it is already done by dti.py
remove reordering of the eigenvalues-eigenvector since it is already done by dti.py

villalonreina/dipy,nilgoyyou/dipy,nilgoyyou/dipy,FrancoisRheaultUS/dipy,FrancoisRheaultUS/dipy,JohnGriffiths/dipy,matthieudumont/dipy,JohnGriffiths/dipy,StongeEtienne/dipy,matthieudumont/dipy,villalonreina/dipy,StongeEtienne/dipy