[Freeciv-Dev] (PR#8743) starting points in scenarios

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=8743 >

I noticed and reported this before (can't find the ticket right now) but 
never realized that this is our fault.

Starting points in scenarios list the nation to be placed there by 
index.  So if you place the Americans in North America you're putting 
nation 37 (or whatever) there.  This works fine until the user adds 
another nation - then it will all break.

This is our fault because we now allow people to add new nations 
willy-nilly, but we never fixed this part of it.

Also, a scenario that has starting positions listed should only allow 
players to choose a nation from the set of available starting positions.

jason