Correct locale setting for Subversion. Previously pysvn would throw a nasty error on non-ASCII UTF-8 filenames, because its locale was not set to UTF-8. Now locale.setlocale is called on all Python scripts which use pysvn (ivle-fetchsubmissions, ivle.fileservice_lib, diffservice, svnlogservice).
bin/ivle-buildjail: Now runs locale-gen as root inside the jail when run with -u. This is necessary to make en_US.UTF-8 a valid locale; otherwise ALL JAIL CODE will now crash!