<URL: http://bugs.freeciv.org/Ticket/Display.html?id=39409 >
As I was testing the patch, I noticed that there were 6 available node
colors. Not all make sense for edges, but flagging those currently
reachable and researching might be visually helpful on long lines.
I also noticed the .h comments don't match the colors, but I didn't fix
them. Maybe they are of historical interest....
Committed trunk revision 13017, S2_1 revision 13018.
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