Rework the user details screen to be less crap... Highlights include:

  - Map is smaller and placed to the side with lists of friends
    and nearby users (now excluding friends) beside it.

  - Map includes friends as well as nearby users.

  - Friend and nearby user lists include photos and links to
    friend/unfriend as appropriate.

  - OAuth settings link moved up with all the other links in the
    main navigation bar.

The addition of friends to the map also carries through to the user
settings page.