Add default value for argument

Change-Id: I89511c45e4c4c0f585d9c04eaca0131066db975b

Common/DataModel/vtkCellLocator.h

@@ -259,7 +259,7 @@ protected:
 
   void ComputeOctantBounds(int i, int j, int k);
   double OctantBounds[6]; //the bounds of the current octant
-  int IsInOctantBounds(double x[3], double tol)
+  int IsInOctantBounds(double x[3], double tol = 0.0)
     {
     if ( this->OctantBounds[0]-tol <= x[0] && x[0] <= this->OctantBounds[1]+tol &&
          this->OctantBounds[2]-tol <= x[1] && x[1] <= this->OctantBounds[3]+tol &&