Overload graph copy methods in vtkMolecule.

The graph IO classes use these to create the final data object,
but they were leaving the bond list out-of-sync.

Common/DataModel/vtkMolecule.cxx

@@ -340,6 +340,21 @@ void vtkMolecule::DeepCopy(vtkDataObject *obj)
   this->DeepCopyAttributes(m);
 }
 
+//----------------------------------------------------------------------------
+bool vtkMolecule::CheckedShallowCopy(vtkGraph *g)
+{
+  bool result = this->Superclass::CheckedShallowCopy(g);
+  this->BondListIsDirty = true;
+  return result;
+}
+
+//----------------------------------------------------------------------------
+bool vtkMolecule::CheckedDeepCopy(vtkGraph *g)
+{
+  bool result = this->Superclass::CheckedDeepCopy(g);
+  this->BondListIsDirty = true;
+  return result;
+}
 
 //----------------------------------------------------------------------------
 void vtkMolecule::ShallowCopyStructure(vtkMolecule *m)

Common/DataModel/vtkMolecule.h

@@ -184,6 +184,18 @@ public:
   vtkGetObjectMacro(ElectronicData, vtkAbstractElectronicData);
   virtual void SetElectronicData(vtkAbstractElectronicData*);
 
+  // Description:
+  // Performs the same operation as ShallowCopy(),
+  // but instead of reporting an error for an incompatible graph,
+  // returns false.
+  virtual bool CheckedShallowCopy(vtkGraph *g);
+
+  // Description:
+  // Performs the same operation as DeepCopy(),
+  // but instead of reporting an error for an incompatible graph,
+  // returns false.
+  virtual bool CheckedDeepCopy(vtkGraph *g);
+
   // Description:
   // Shallow copies the data object into this molecule.
   virtual void ShallowCopy(vtkDataObject *obj);