libravatar shutdown

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+Unfortunately libravatar is being shut down on 2018-09-01
+<https://blog.libravatar.org/posts/Libravatar.org_is_shutting_down_on_2018-09-01/>
+
+This is used in the comments plugin to get an avatar url.
+
+It would probably be best to remove the code that tries to use it, in case
+its dns eventually gets taken over by something that causes some kind of
+problem. (The shutdown page doesn't say what will happen to the DNS.)
+
+It might also be a good idea to filter out avatar urls in existing comments
+that point to libravatar.org. --[[Joey]]