Multi adaptive vertex fitter

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

Core/include/Acts/Vertexing/ZScanVertexFinder.ipp

@@ -98,12 +98,12 @@ Acts::ZScanVertexFinder<bfield_t, input_track_t, propagator_t>::find(
     }  // end of lookup/compute z0AndWeight
 
     if (z0AndWeight.second >= 0.01) {
-      ZPositions.push_back(z0AndWeight);
+      zPositions.push_back(z0AndWeight);
     }
   }  // end of loop over perigeeList
 
-  if (!ZPositions.empty()) {
-    ZResult = m_cfg.mode1dFinder.getMode(ZPositions);
+  if (!zPositions.empty()) {
+    ZResult = m_cfg.mode1dFinder.getMode(zPositions);
 
     ACTS_DEBUG("Resulting mean Z position found: " << ZResult);
   }