* message.el (message-send-news): Modify the value of

* message.el (message-send-news): Modify the value of
 `mime-field-encoding-method-alist' to encode newsgroup names.

* gnus-art.el (gnus-article-header-presentation-method): Call
 `article-decode-group-name' to decode newsgroup names.
(gnus-article-decode-hook): Default to nil.

Synch with Oort Gnus:

* gnus-group.el (gnus-group-name-charset-group-alist): Use
 `find-coding-system' for XEmacs to check whether the coding-system `utf-8'
  is available.