Moved documentation out of contrib.
Mostly tweaked some wording. Moved documentation of various bits to other
pages (pagespec, etc), and linked to those.
Documented the new templates in wikitemplates.
Small quantities of documentation were removed. Particularly the list of
template variables, which I think is fairly obvious when editing the
template.
edited.
* Move code forcing signing before edit to a new "signinedit" plugin, and
code checking for locked pages into a new "lockedit" plugin. Both are
enabled by default.
* Remove the anonok config setting. This is now implemented by a new
"anonok" plugin. Anyone with a wiki allowing anonymous edits should
change their configs to enable this new plugin.
* Add an opendiscussion plugin that allows anonymous users to edit
discussion pages, on a wiki that is otherwise wouldn't allow it.
* Lots of CGI code reorg and cleanup.