[Freeciv-Dev] (PR#10960) ending the game is super-slow

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=10960 >

I think this is a larger problem of the game ending taking a really long 
time.  However one symptom (and for that matter, cause) of the problem 
is that the overview viewrect flickers a lot.

- Start a new game.
- Disband all your units.
- Everything is fast and the overview is pretty.

- Start a new game.
- Type /end.
- The ending is super-slow, the overview and mapview are updated 
piecemeal, and the overview flickers a lot.

- Start a new game.
- /set endyear -4000.
- End turn.
- Again, super-slow.

I don't know what causes this, but I'm sure it should be easy to fix.

jason