added functions to generate abutting skip node lists for the junctions
added functions to generate abutting skip node lists for the junctions

mmuggli/KOHDISTA,mmuggli/doppelganger,mmuggli/doppelganger,mmuggli/KOHDISTA,mmuggli/KOHDISTA,mmuggli/doppelganger,mmuggli/doppelganger,mmuggli/KOHDISTA