TST: Get the VTK installation to be its own thing.
TST: Get the VTK installation to be its own thing.

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