Todo for interface extension
* make mtx-wikipage use argument ordinals for generation (so that some stuff can be user-deleted from the doc stanza)?
* extend mtx-wikipage to display the command level and keywords
* test and fix mtx-wikipage for all stanzas
* convert mtx-wikipage to expat parser
* make wikipage generate show/hide options for sections to keep page clean
* add mtx-wikipage to extension
* cleanup and put snippets on server
* see what can be done about auto-instantiation of command pages (need to keep track of existing pages)
* document the new stuff (ref pages, env/cmd split, variants)
* fix/extend the <nowiki>{{cmd}} and {{env}}</nowiki> templates
* existing page merging (jikes!)