Omit 'external' changes from ChangesFeed
The current formatting does not display these
external changes very well (e.g. doesn't distinguish
between local and foreign wiki user or whatnot).
Unless there is better handling or integration of these,
also with the option of hiding or showing, it is best
to simply exclude these from the feed.
This brings the ChangesFeed inline with default
behavior of Special:RecentChanges and Watchlist.