Ability to import public posts via JSON - without this, you can
get replies to posts that haven't been seen.
Handle MD in profile.
Tone down some of the asserts because they can be triggered in normal
operation. Some basic documentation for the various classes.
Yay OCD.
Only display subs button for local users. Hope some day we can see
remote users to aid discovery, but the federation protocol doesn't
permit it yet.