* 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).
+* add_depends() needs work. If there are two preprocessor directives on a page, and one calls add_depends("foo"), while the other calls add_depends("* !foo"), the second one wins, page foo will not be matched by the appended globlist.
+
+ What it needs to do is be smarter about merging depends, so if "foo" is added to "!foo", it should yeild "foo"; adding "!foo" to "foo" should again yeild "foo". That's easy, what's hard is when there are globs involved and potentially partially overlapping included and excluded subsets..
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