underlaydir gets a mtime newer than the mtime the removed file had.
* ikiwiki will generate html formatted error messages to the command
line if --cgi is set, even if it's not yet running as a cgi
+* if a page containing an rss feed happens to show up in an rss feed,
+ the preprocessor directives won't be expanded (good) but are left in
+ raw rather than removed (bad)