(rfc2047-point-at-bol, rfc2047-point-at-eol): New. Callers of

(rfc2047-point-at-bol, rfc2047-point-at-eol): New.  Callers of
gnus- versions changed to use them.
(rfc2047-header-encoding-alist): Add `address-mime' part.  Doc
fixes.
(rfc2047-encoding-type): New.
(rfc2047-encode-message-header): Use mm-charset-to-coding-system.
Don't include header name field in encoding.  Add `address-mime'
case and bind rfc2047-encoding-type for `mime' case.
(rfc2047-encodable-p): Deleted.
(rfc2047-syntax-table): New.
(rfc2047-encode-region, rfc2047-encode): Rewritten to take account
of rfc2047 rules with respect to rfc2822 tokens and to do encoding
in place rather than by passing strings.
(rfc2047-encode-string): Doc fix.
(rfc2047-q-encode-region): Don't use mm-with-unibyte-current-buffer.
(rfc2047-encoded-word-regexp): eval-and-compile.
(rfc2047-decode-region): Avoid concatenation in loop.
(rfc2047-parse-and-decode): Remove useless disjunction.