To fix bug 629334. On the way, some old .cvsignore files were deleted.
Also, Makefiles and headers were adapted to show the new URL. Calendars
have not been updated.
This was generated using mkical.py -t. In the future, we should consider
to automatically create that on the server side. But then again, that
adds little benefit for a potentially big overhead.
This was separate because it takes less time to renew a membership. But
we asked the currently existing members already to renew their
membership so we can decrease the complexity by getting rid of another
deadline.
