[Freeciv-Dev] (PR#6943) Playable nations for map?

["Eugeny Korekin" <az@xxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=6943 >

Is there any possibility to flag nations, which are playable
for given map? For example, there is no place for Indians
on the map europe-200x100-v2.sav, but if computer player is
created with aifill option, Indians can come into play, so
the only possibility to avoid that is to create players manually.

I think, adding map option to flag playable nations for that map
can be very useful for balanced map with fixed starting positions.

If there is no such option for now(i cannot find one), i think,
I can implement that.