magneticod:
!!! disabled the gradual increase in congestion control, for some reason we still can't detect congestion...
- `*net.UDPAddr` in dht/mainline instead of `net.Addr`
- fixed a bug when a very small extension message received
- simplified how peer adress is handled in bittorrent/metadata/sink
- simplified TrawlingResult in dht/mainline
magneticow:
- use WAL for sqlite3
persistence:
- use URL.String() instead of url.Path in sql.Open() so that URL parameters are not lost...
