[Merge] lp:~abompard/mailman/bug-1060951 into lp:mailman

Aurélien Bompard has proposed merging lp:~abompard/mailman/bug-1060951 into lp:mailman. Requested reviews: Mailman Coders (mailman-coders) Related bugs: Bug #1060951 in GNU Mailman: "Bug getting i18n'ed attachment filenames (RFC2231)" https://bugs.launchpad.net/mailman/+bug/1060951 For more details, see: https://code.launchpad.net/~abompard/mailman/bug-1060951/+merge/243401 This branch solves bug #1060951 by removing the auto-conversion of headers to unicode in the Message class. -- Your team Mailman Coders is requested to review the proposed merge of lp:~abompard/mailman/bug-1060951 into lp:mailman.