Synch with `semi-1_14_2'.

Synch with `semi-1_14_2'.

Morioka-san, the implementation of `pgg-pgp-process-region' is
different from `pgg-gpg-process-region'.  In the latter I don't expect
OpenPGP packets in the output of the "gpg" command.

* pgg-pgp.el (pgg-pgp-messages-coding-system): Abolish.
(pgg-pgp-process-region): Use `binary-funcall' instead of
`binary-to-text-funcall'.

* pgg-pgp5.el (pgg-pgp5-messages-coding-system): Abolish.
(pgg-pgp5-process-region): Use `binary-funcall' instead of
`binary-to-text-funcall'.