Remove vtk stuff.
No one seems to be using this, so we remove it while we can in order to avoid maintaining it. It currently gives warnings when running Sphinx and pyflakes. And there is a failing test (disabled for a long time).
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
No one seems to be using this, so we remove it while we can in order to avoid maintaining it. It currently gives warnings when running Sphinx and pyflakes. And there is a failing test (disabled for a long time).