[VM] Incorrectly encoded non-ASCII headers

[Yeechang Lee]

(Disclaimer: I am on Emacs 23 and VM 8.1.2.)

I sometimes receive messages in which headers--usually the subject
line--uses non-ASCII characters without quoting them as per RFC
2047. (Wikipedia's article-of-the-day mailing list is a frequent
offender.)

I realize the best solution is to have the sender change its ways and
emit standards-adhering messages, but in the meanwhile, could VM gain
the ability to assume that the body's encoding style in a message also
applies to the headers? An alternative would be to assume that headers
are 8-bit clean unless RFC 2047-style quoting appears. (Can either be
done on our own with some elisp in the meanwhile, I wonder? I wouldn't
want the message itself modified; just the presentation buffer.)