[Freeciv-Dev] shared vision again

[Thue <thue@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

I at last got the XAW client working...

Now you can in the diplomatic dialog agree to a shared vision clause. As long
as the clause is in effect all map info will be passed along. one clause only
gives vision one way.
The effect is transitive; if p1 gives info to p2 and p2 to p3, p1 in effect
also gives to p3.
Shared vision can be cancelled at any time via a button in the players dialog.

-Thue

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