(message-parameter-alist): New variable.

(message-parameter-alist): New variable.
(message-startup-parameter-alist):  New variable.
(message-fetch-reply-field): Get reply buffer with
`message-get-reply-buffer()'.
(message-yank-original): Ditto.
(message-eval-parameter): New function.
(message-get-reply-buffer): Ditto.
(message-get-original-reply-buffer): Ditto.
(message-mode): New buffer local variable
`message-parameter-alist'.
(message-setup): Set up `message-reply-buffer' from
`message-parameter-alist'.
(message-mime-insert-article): Get `Original message buffer' with
`message-get-original-reply-buffer' instead of
`gnus-original-article-buffer'.
Remove bogus header fields for forwarding message.