- Why do so many source go into 'timed out' state and are not removed? should they be?
  Update: I think it is giFT which times out the sources. Not sure what to do about it.

- Disabled sharing makes other nodes ask us for pushes

- Don't send shares if shares are hidden

- Add download throttling. Difficult due to multiple indirections through downconn
  and http server. Not very effective in general.