* Add an underlay for javascript, and add ikiwiki.js containing some utility
code.
* toggle: Stop embedding the full toggle code on each page using it, and
move it to toggle.js in the javascript underlay.
* toc: Revert change in 2.45 that made it run at sanitize time. This breaks
use of toc in a sidebar.
* Call format hooks when generating page previews, thus fixing toc display
there, as well as fixing inlins to again display in page previews, since
it's started using format hooks. This also allows several other things,
like embed, that use format hooks, to work during page preview time.
* Format hooks should not rely on getting an entire html document, as they
will only get the body during page preview.
* toggle: Deal with preview mode when adding javascript.
for extended pagespecs. The old calling convention will still work for
back-compat for now.
* The calling convention for functions in the IkiWiki::PageSpec namespace
has changed so they are passed named parameters.
* Plugin interface version increased to 2.00 since I don't anticipate any
more interface changes before 2.0.
* Introduce the nicebundle. This is a kind of plugin, that just enables
many other plugins. It's an easy way to boost ikiwiki from its default,
basic wiki, to a full-featured wiki, without manually picking the right
set of plugins. New plugins will be added to the nicebundle from time to
time.