new or updated Groundnets

[portreekid]

The first ones look much better with a little bit of "Intelligence". It searches for intersecting lines backwards and takes the nearest. I just saw the bottom unconnected ones need the old search because the line isn't long enough. Aim is only to have a good starting point for manual editing and still beta. I'd be happy for any test data like CYUL



If none is found it tries forwards and adds a forward line.