* Add an AboutUserID field to feedbacks, so when the report is about a
picture that is later deleted, the feedback can still link to the
original owner's account instead of showing an error.
* Add filters to the User Notes page so the admin can see:
* All feedback From or About the user or their content (default)
* Feedback created by the user
* Feedback about the user or their content
* Fuzzy search for any feedback containing the user's name.
* On chat room reports: make the @channel ID a clickable user profile
link for convenience.
