Removed explicit destructors for vtkAtom and vtkBond

Neither was needed as they were both empty and did nothing - the
compiler generated destructor can do this and it fixes the Clang++
warnings on the dashboards.

Change-Id: If5bbaa77669058c82f8ad6a66256a9b712aa753e

Common/DataModel/vtkAtom.cxx

@@ -27,11 +27,6 @@ vtkAtom::vtkAtom(vtkMolecule *parent, vtkIdType id)
   assert(id < parent->GetNumberOfAtoms());
 }
 
-//----------------------------------------------------------------------------
-vtkAtom::~vtkAtom()
-{
-}
-
 //----------------------------------------------------------------------------
 void vtkAtom::PrintSelf(ostream &os, vtkIndent indent)
 {

Common/DataModel/vtkAtom.h

@@ -28,8 +28,6 @@ class vtkVector3f;
 class VTKCOMMONDATAMODEL_EXPORT vtkAtom
 {
  public:
-  ~vtkAtom();
-
   void PrintSelf(ostream &os, vtkIndent indent);
 
   // Description:

Common/DataModel/vtkBond.cxx

@@ -31,11 +31,6 @@ vtkBond::vtkBond(vtkMolecule *parent, vtkIdType id,
   assert(endAtomId < parent->GetNumberOfAtoms());
 }
 
-//----------------------------------------------------------------------------
-vtkBond::~vtkBond()
-{
-}
-
 //----------------------------------------------------------------------------
 void vtkBond::PrintSelf(ostream &os, vtkIndent indent)
 {

Common/DataModel/vtkBond.h

@@ -27,7 +27,6 @@ class vtkMolecule;
 class VTKCOMMONDATAMODEL_EXPORT vtkBond
 {
 public:
-  ~vtkBond();
   void PrintSelf(ostream &os, vtkIndent indent);
 
   // Description: