Add spacing/refinement consistency check

vtkOverlappingAMR offers an `Audit` (debug) method.
Update it to also catch spacing vs refinement consistency.

Common/DataModel/vtkAMRInformation.cxx

@@ -6,6 +6,7 @@
 #include "vtkDoubleArray.h"
 #include "vtkIntArray.h"
 #include "vtkMath.h"
+#include "vtkMathUtilities.h"
 #include "vtkObjectFactory.h"
 #include "vtkStructuredGrid.h"
 #include "vtkUnsignedIntArray.h"
@@ -231,6 +232,26 @@ bool vtkAMRInformation::Audit()
         vtkErrorMacro("Invalid spacing at level " << i << endl);
       }
     }
+
+    if (this->HasRefinementRatio())
+    {
+      double ratio = this->Refinement->GetTuple1(0);
+      unsigned int nextLevel = i + 1;
+      if (nextLevel < this->GetNumberOfLevels())
+      {
+        double nextSpacing[3];
+        this->GetSpacing(nextLevel, nextSpacing);
+        for (int axis = 0; axis < 3; axis++)
+        {
+          if (axis != emptyDimension &&
+            !vtkMathUtilities::NearlyEqual(
+              ratio, vtkMathUtilities::SafeDivision(h[axis], nextSpacing[axis]), 10e-6))
+          {
+            vtkErrorMacro("Spacing and refinement ratio are inconsistent for level " << i << endl);
+          }
+        }
+      }
+    }
   }
 
   // check amr boxes