Patch 2.1 file

This is not only a patch, but more a kind of mini-AddOn, adding some minor features and finally bringing Guilds back to "The Guild 2", with special quests and nice rewards to gather as well as the title of an "Alderman" to acquire there. Of course there are also a lot of bugfixes, including pathfinding, game logic, management of supply and demand of goods, stability issues, out of sync problems (multiplayer stability!) and many others.