Restoring scene view duplicates scene heirarchy

[lassoan (Andras Lasso)]

@muratmaga

It is not very useful as is, so it can be axed.

It is very useful feature and it can be fixed with today’s Slicer infrastructure much more easily than years ago. We could save display nodes (and camera and slice nodes, maybe the layout node) to sequence nodes, essentially automating the manual workflow that I showed here.