Merge topic 'if-before-delete' into master

Common/ComputationalGeometry/vtkCardinalSpline.cxx

Common/ComputationalGeometry/vtkKochanekSpline.cxx

Common/Core/vtkBitArray.cxx

Common/Core/vtkBitArrayIterator.cxx

Common/Core/vtkDebugLeaks.cxx

Common/Core/vtkIdList.cxx

Common/Core/vtkPriorityQueue.cxx

Common/Core/vtkScalarsToColors.cxx

Common/Core/vtkSetGet.h

Common/Core/vtkStringArray.cxx

Common/Core/vtkVariantArray.cxx

Common/Core/vtkVoidArray.cxx

Common/DataModel/Testing/Cxx/TestAMRBox.cxx

Common/DataModel/vtkAbstractCellLocator.cxx

Common/DataModel/vtkBSPCuts.cxx

Common/DataModel/vtkBSPIntersections.cxx

Common/DataModel/vtkCellLinks.cxx

Common/DataModel/vtkCellLocator.cxx

Common/DataModel/vtkDataSetAttributes.cxx

Common/DataModel/vtkEdgeTable.cxx