New feature: User Notes
* Add a "Notes" tab to user profile pages and galleries.
* Users can create one private note about another user.
* Admins can see all notes left about a user.
* Admins also see Feedback & Reports regarding the user on that page.
Bring back the online chatters list
* The Usernames are filtered down based on blocklist status.
* Users with private profiles or no public photo at all are considered
to be Shy Accounts and are isolated from the non-shy profiles.
* Restrictions include:
* Site Gallery shows only them + their friends' photos.
* User Galleries: must be a friend or had private photos granted to
see a user's gallery page.
* DMs: can not initiate a DM to a non-shy member (other shy members
OK).
