Fix #1516. Also fixed (probably unrelated) bug that first time STK
is started with internet permission, the addon server would not be
accessible. Note: any current configuration will not be read anymore
(if you need it, you can just move the files and directories from
.../supertuxkart into .../supertuxkart/0.8.2  (except addons, whic
stays in .../supertuxkart/addons!!).