Fix crash on tortuosity module
Fix crash on tortuosity module

The crash happened on data with multiple vessels. The index used in
the filter->GetInflectionPointValue simply wasn't correct.

Also remove the debug array "NumberOfPoints" that had managed to slip
through.

agirault/VesselView,matthieuheitz/VesselView,KitwareMedical/VesselView,sumedhasingla/VesselView,sumedhasingla/VesselView,agirault/VesselView,KitwareMedical/VesselView,matthieuheitz/VesselView,sumedhasingla/VesselView,KitwareMedical/VesselView,agirault/VesselView,matthieuheitz/VesselView