def get_supported_conversions():
    """Return an iterable of tuples in the form (key, name, extension,
        in_mimetype, out_mimetype, quality) representing the MIME conversions
        supported and
        the quality ratio of the conversion in the range 0 to 9, where 0 means
        no support and 9 means "perfect" support. eg. ('latex', 'LaTeX', 'tex',
        'text/x-trac-wiki', 'text/plain', 8)"""
