* lisp/textmodes/emacs-news-mode.el (emacs-news-toggle-tag): New
command.
(emacs-news-mode-map): Bind above new command to "C-c C-t".
* test/lisp/textmodes/emacs-news-mode-resources/toggle-tag.erts:
* test/lisp/textmodes/emacs-news-mode-tests.el: New files.