* Turn $config{wiki_file_prune_regexps} into an array that is easier to••• manipulate.
* Only exclude rss and atom files from processing if the inline plugin
is enabled and that feed type is enabled. Else it's just a copyable file
type.
* Move rss and atom option handling code into the inline plugin.
* Applied a rather old patch from Recai to fix the "pruning is too strict"
issue. Now you can have wiki source directories inside dotdirs and the
like, if you want.