sverchok for blender: cleaning node trees

cleaning node trees of sverchok and blendgraph, all custom node trees. it not affect fake usered layouts in hard mode and cleaning only zero-user layouts in soft mode. please, follow all playlist https://www.youtube.com/watch?v=hLQAYTKK250&list=PLIKEZ9RntI98CN4L7iqeRd3V-Fwz7Sr8-