- Drop incoming connections on HTTP port
   - Define port 6881 in one place
   - Don't let random DHT port be 6881
   - Exception tweak

   - Increase dest lookup and search timeouts
   - Increase max search depth
   - Loop tracker client faster when in magnet mode
   - Loop tracker client faster if DHT announce fails
   - Don't return an empty peers list if we only know about the requestor
   - volatiles, log tweaks
   - Major fixes of getPeers() to follow

   - Improve torrent shutdown handling to maximize chance of
     announces getting to tracker
   - Clean up delete-torrent messages
   - Remove redundant shutdown hook
   - Avoid NPE in PEX message handling
   - Log tweaks

- Change DHT from option bit to extension message
- Add DHT start/stop code
- Add UI for DHT enabling
- Add raw datagram protocol type and use for response port

Handle announce URLs with parameters correctly

- Disable KRPC
- Shorten tracker string

- Better BEValue.toString()

(most of the following got missed in the last checkin)
- Fix about 9 NPEs
- Fix numwant in magnet mode
- Send metadata size in extension handshake
- Open trackers are primary if we don't have primary trackers
- Add missing break in port message handling
- Increase max msg size to account for metadata msg
- Remember magnets across restarts
- Drop peers w/o extensions if we need metainfo
- Fix DATA messages
- Fix tracker transition to non-magnet
- Fix infohash for non-magnet
- Fix up peer transition to non-magnet
- More logging

- Record the metadata bandwidth
- More null announce handling
- Callbacks for got MetaInfo event
- Cleanups