Default implementation: If view is of a VertexModel returns a
SwingGraphVertex, if an EdgeShape returns a SwingGraphEdge;
otherwise, returns a NullGraphicView.
Called by the client to create a new whole view of a whole model,
including its graphic implementation and any part views and their
graphic implementations.
Default implementation: Creates a new whole view, using
newWholeViewGraphic() for the graphic, saves it as the current
whole view, makes connections to the whole model for part model
updates, then calls createdWholeView().