Comment 2 for bug 1656661

Some more features I forgot to mention:
- blind/buried vias can be automatically created when line drawing moves from one layer to another
- blind/buried vias can be created when line segment is moved to another layer - it affects only newly created vias
- both features are controlled by option

Missing:
 - when line segment is moved to another layer, blind/buried vias are not adjusted - feedback from designers using blind/buried vias is necessary as there is several options how to handle it.