* mime-play.el (mime-show-echo-buffer): Make it returns the list of window,

* mime-play.el (mime-show-echo-buffer): Make it returns the list of window,
start and end positions of inserted text; adjust a window height to the value
of `mime-echo-window-height' whenever this function is called; bind
`window-min-height' to 1 during splitting a window vertically.

* mime-pgp.el (mime-pgp-fetch-key): Enclose a tcp process with a temp buffer.
(mime-pgp-show-fetched-key-for-pgp50): Always use `mime-show-echo-buffer' for
displaying a fetched key; optimize its window height.
(mime-pgp-show-fetched-key): Likewise.
(mime-pgp-keyserver-port): Replace "HTTP" with "HKP" in doc string.
(mime-verify-application/pgp-signature): Optimize a height of window where
some informations are displayed.
(mime-pgp-parse-verify-error): Likewise.
(mime-pgp-show-echo-buffer): New macro.
(mime-pgp-parse-verify-error-for-pgp): Make it to accept an arg
`output-buffer' and to return the list of expected key-ID, start position and
lines to be shown a result.
(mime-pgp-parse-verify-error-for-pgp50): Likewise.
(mime-pgp-parse-verify-error-for-gpg): Likewise.
(mime-pgp-parse-verify-error): Likewise.
(mime-pgp-check-signature): Returns a start position and lines to be used for
how a result should be displayed in echo window.
(mime-pgp-detect-version): Bug fix -- save restriction before narrowing.