BUG: Use smart pointer for table in vtKTanglegramItem.

Using smart pointer for the table object (for correspondence)
of the vtkTangelgramItem class prevents seg fault when rendering
the tanglegram via vtkWeb.

Change-Id: I1027ea7c40621227546dd4ae62543041efb6c906
Merge topic 'TanglegramFixForVtkWeb' into master

59da79c1 BUG: Use smart pointer for table in vtKTanglegramItem.