Autoload.
(quoted-printable-decode-region): Rename arg which confused
charset with coding-system. Don't use nonascii-insert-offset.
Coding-system encode the region initially. Don't recognize `=='
as valid QP. Coding-system decode the region finally.
(quoted-printable-decode-string): Rename arg which confused
charset with coding-system.
(quoted-printable-decode-region): Rewritten.
(quoted-printable-decode-string, quoted-printable-encode-region):
Doc fix.
(quoted-printable-encode-region): Barf on multibyte characters.
Maybe make the class multibyte. Upcase chars, not formatted
strings. Allow mm-use-ultra-safe-encoding to be unbound.
(quoted-printable-encode-string): Don't use
mm-with-unibyte-buffer.
