Multi adaptive vertex fitter

Implements the multi adaptive vertex fitter and all related required tools.

Core/include/Acts/Vertexing/ZScanVertexFinder.ipp

@@ -28,7 +28,7 @@ Acts::ZScanVertexFinder<bfield_t, input_track_t, propagator_t>::find(
 
   // Prepare the vector of points, on which the 3d mode has later to be
   // calculated
-  std::vector<DoubleAndWeight> ZPositions;
+  std::vector<DoubleAndWeight> zPositions;
 
   for (auto& iTrk : trackVector) {