* mime-mc.el (mime-mc-pgp50-sign-region, mime-mc-gpg-sign-region): Detect and

* mime-mc.el (mime-mc-pgp50-sign-region, mime-mc-gpg-sign-region): Detect and
cache the value of message integrity check algorithm before signing if the
value of `mime-mc-ommit-micalg' is nil.
(mime-mc-gpg-process-region): Show boundary in `mc-gpg-debug-buffer'.
(mime-mc-pgp-process-region, mime-mc-pgp50-process-region,
mime-mc-gpg-process-region): Add doc string.
(mime-mc-micalg-alist): New variable.
(mime-mc-ommit-micalg): New user option.
(TopLevel): Require `alist' and `std11'.

* mime-pgp.el (TopLevel): Add comment that this module is based on
draft-yamamoto-openpgp-mime-00.txt (OpenPGP/MIME) as well.