[python] mimetools, декодирование attachment

mimetools deprecated since release 2.3. The email package should be used in preference to the mimetools module.
http://www.python.org/doc/current/lib/module-email.html

Here are the methods of the Message class:
get_filename([failobj])
    Return the value of the filename parameter of the Content-Disposition: header of the message. 
    The returned string will always be unquoted as per Utils.unquote().