From Daiki Ueno <daiki@kiss.kake.info.waseda.ac.jp>

From Daiki Ueno  <daiki@kiss.kake.info.waseda.ac.jp>
* lisp/gnus.el (gnus-revision-number): Increment to 06.
* lisp/mail-source.el (mail-source-keyword-map): New keyword
:connection for pop. This is introduced to enable SSL connection.
(mail-source-fetch-pop): Use it to bind `pop3-connection-type'.
* lisp/pop3.el : Add an autoload for `open-ssl-stream' defined in
`ssl'.
(pop3-connection-type, pop3-ssl-program-arguments): New variables.
(pop3-open-ssl-stream-1, pop3-open-ssl-stream): New functions.
(pop3-open-server): Call the latter when `pop3-connection-type' is
ssl.