Merge following changes from semi-1_14 branch:

Merge following changes from semi-1_14 branch:

* pgg-gpg.el (pgg-gpg-process-region): Use `make-temp-file' instead of
`make-temp-name'.
Add --yes option to overwrite existing output file;
Remove needless set-default-file-modes.
* pgg-pgp5.el (pgg-pgp5-process-region): Ditto.
(pgg-scheme-verify-region): Ditto.
(pgg-scheme-snarf-keys-region): Ditto.
* pgg-pgp.el (pgg-pgp-process-region): Ditto.
(pgg-scheme-verify-region): Ditto.
(pgg-scheme-snarf-keys-region): Ditto.
* mime-pgp.el (mime-verify-application/pgp-signature): Ditto.
* mime-play.el (mime-activate-mailcap-method): Make a temporary
directory of a temporary file for the mailcap application.
(mime-mailcap-method-sentinel): Follow the change above.
(mime-require-safe-directory): New function.
(mime-store-message/partial-piece): Use it.
Set `default-file-modes' for `make-directory'.
* mime-edit.el (mime-edit-split-and-send): Remove local variable
`mime-edit-draft-file-name'.

* mime-play.el (mime-play-delete-file-immediately): New user option.
(mime-mailcap-method-sentinel): Use it.
(mime-mailcap-delete-played-files): New function; set up for
`kill-emacs-hook'.