+ * Reorganize index file, add a format version field. Upgrades to the new
+ index format should be transparent.
+ * Add %wikistate, which is like %pagestate except not specific to a given
+ page, and is preserved across rebuilds.
+ * editpage: Be more aggressive (and less buggy) about cleaning up
+ temporary files rendered during page preview.
+ * httpauth: Document that ikiwiki.cgi has to be in a directory subject to
+ authentication. Closes: #500524