* S3/Utils.py: New function replace_nonprintables() * s3cmd: Filter local filenames through the above function to avoid problems with uploaded filenames containing invalid XML entities, eg  * S3/S3.py: Warn if a non-printables char is passed to urlencode_string() - they should have been replaced earlier in the processing. * run-tests.py, TODO, NEWS: Updated. * testsuite/crappy-file-name.tar.gz: Tarball with a crappy-named file. Untar for the testsuite.