RF: Use xrange when possible/appropriate.
RF: Use xrange when possible/appropriate.

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