[Freeciv-Dev] patch: treaty disconnect for multi-conn (PR#530)

[David Pfitzner <dwp@xxxxxxxxxxxxxx>]

Related to recent fix to remove diplomacy meetings on disconnection,
this patch makes fixes mainly for multi-connect case:
- Close all diplo dialogs on client side on disconnection (general case);
- For multi-connections send data for ongoing meetings when connect;
- Only cancel meeting on disconnect when last controller disconnects;
- Send cancel notification to originating player for other connections;
- Minor static/header cleanups along the way.

(Includes untested gui-mui changes; parts of diplodlg.c could be 
made gui-indep fairly easily.)

-- David

discon_treaty_multi1a.diff.gz
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