** Convert "seconds from epoch" to a date string.
** Confirm passphrase when performing symmetric encryption.
** New commands which affect on the current region are implemented.
epa-decrypt-region, epa-verify-region, epa-decrypt-armor-in-region,
epa-verify-armor-in-region, epa-sign-region, epa-encrypt-region
** Fixed ERRSIG status handling. "no public key" error was not
reported as a verify result.
** Fixed cleaning up pgg-*-buffer (pgg-epg.el).
** Don't convert line endings of the gpg output. This may fix a bug
when encrypting in textmode and the output is binary.