[Freeciv-Dev] [Patch] for to players_iterate

[Raimar Falke <hawk@xxxxxxxxxxxxxxxxxxxxxxx>]

The attached patch replaces loops like

  for(i=0; i<game.nplayers; i++)

with players_iterate. 90% are straightforward. Can somebody look at
the change of ai_manage_diplomat? Especially what 

   if (!ctarget && aplayer) {

should mean? The loop in handle_unit_enter_city and one in
server/meta.c were been eliminated completely. update_diplomatics also
got some more serve changes. And also srv_main was changed in a
non-trivial way.

        Raimar

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