BF: Calculation of eigen-vectors was confused by sign reversal.
BF: Calculation of eigen-vectors was confused by sign reversal.

This should fix this. No other side effects, as far as I could tell.

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