source file, to allow tracking of extra rendered files like rss feeds.
* Note that plugins that accessed this variable will need to be updated!
The plugin interface has been increased to version 1.01 for this change.
* Add will_render function to the plugin interface, used to register that a
page renders a destination file, and do some security checks.
* Use will_render in the inline and linkmap plugins.
* Previously but no longer rendered files will be cleaned up.
* You will need to rebuild your wiki on upgrade to this version.
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