* gnus-art.el (gnus-treat-newsgroups-picon): New variable.

* gnus-art.el (gnus-treat-newsgroups-picon): New variable.

* gnus-picon.el (gnus-treat-newsgroups-picon): New function.
(gnus-picon-transform-newsgroups): New function.

* ietf-drums.el (ietf-drums-parse-addresses): Accept a nil
string.

* gnus-picon.el (gnus-treat-mail-picon): Renamed.

* gnus-art.el (gnus-treat-cc-picon): New variable.
(gnus-treat-mail-picon): Renamed.

* gnus-picon.el: New implementation.
(gnus-picon-find-face): Renamed.
(gnus-treat-from-picon): Use it.
(gnus-picon-transform-address): Renamed.
(gnus-treat-from-picon): Use it.
(gnus-picon-create-glyph): Renamed.
(gnus-picon-transform-address): Use it.
(gnus-treat-cc-picon): New command.

* gnus-art.el (gnus-treat-display-picons): Simplify.
(gnus-treat-from-picon): Renamed.

* gnus-art.el (gnus-article-treat-unfold-headers): Doc fix.
(gnus-with-article-headers): New macro.
(gnus-article-goto-header): New function.