Remove duplicate functions.
Remove duplicate functions.

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