* NEWS, mime-ui-en.sgml, mime-ui-ja.sgml: Update for the command

* NEWS, mime-ui-en.sgml, mime-ui-ja.sgml: Update for the command
`mime-mc-setversion'.
* semi-setup (TopLevel): Autoload "mime-mc" for the command
`mime-mc-setversion'.
* mime-mc.el (mime-mc-pgp50-sign-region): Use "micalg=pgp-sha1" instead of
"micalg=pgp-md5"; use `mime-mc-pgp50-sign-parser' for the parser if a detached
sign is required.
(mime-mc-pgp50-sign-parser): New function for parsing a detached sign.
(mime-mc-setversion): New command.
* mime-edit.el (mime-edit-preview-message): Inherit the value of
`mime-edit-pgp-processing' from the editing buffer to the encoding buffer.
(mime-edit-encrypt-pgp-mime): Swap the prefix string of boundary "gpg-" with
"pgp-".