* gnus-art.el (gnus-save-all-headers): Mention it might be overridden.

* gnus-art.el (gnus-save-all-headers): Mention it might be overridden.
(gnus-saved-headers): Ditto.
(gnus-default-article-saver): Mention functions may have properties.
(gnus-article-save): Override gnus-save-all-headers and
gnus-saved-headers by :headers property which saver function may have.
(gnus-summary-save-in-file): Add :headers property.
(gnus-summary-write-to-file): Ditto.

* gnus-sum.el (gnus-summary-save-article): Bind
gnus-prompt-before-saving to t when saving many articles in a file;
always show all headers.

* dgnushack.el: Autoload toggle-truncate-lines for XEmacs.