The relax_io.open_read_file() now supports all Python versions over 2.4.
This required some really nasty hacks for Python 3.0, 3.1 and 3.2 with the Bzip2Fixed and GzipFixed
classes overriding the incomplete and buggy bz2.BZ2File and gzip.GzipFile modules, and being wrapped
around io.TextIOWrapper().