config should be under %appdata%Gajim in windows
someone needs to test that 0.6 config doesn't break Gajim 0.7 if that is true, we need to mv the config [if it exists] from the old path to the new one before releasing 0.7 or else the problem will be bigger coz 0.7 is better than 0.6.1 so more users might use it