(It seems that no one has posted it yet in this forum, so: )
Wernieman had to take his server offline on short notice, for a timeframe of approximately two weeks. Therefore, the nightly builds are not run, and the SVN repositories hosted there (e.g. Pak128?) are not available. The download location of the nightly builds is still available, it is just that updates do not happen.
German post: http://www.simutrans-forum.de/forum/thread.php?postid=71676 (http://www.simutrans-forum.de/forum/thread.php?postid=71676)