[Freeciv-Dev] (PR#6345) starting positions for scenarios

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

The current method of putting down starting units in scenario games is 
highly flawed.  It attempts to match up nations with starting position 
IDs so that the scenario can specify which nation goes where.  But the 
nation is referenced by ID too, so

1.  With lots of nations, it just doesn't work.
2.  When a new nation is added, all existing scenarios have their 
starting positions invalidated.

I'm not sure how this _should_ be done, but the current method is pretty 
worthless.

jason