* Avoid a very strange (unconfirmed) bug that people using the systray's
      browser picker dialog could cause by disabling the GUI-based browser
      picker.
    * Cut down on subsequent streaming lib reset packets transmitted
    * Use a larger MTU more often
    * Allow netDb searches to query shitlisted peers, as the queries are
      indirect.
    * Add an option to disable non-floodfill netDb searches (non-floodfill
      searches are used by default, but can be disabled by adding
      netDb.floodfillOnly=true to the advanced config)