UPnP:
 (ticket #1123)
 - Add new config i2np.upnp.ignore to specify UDNs of ignored devices
 - Add display of ignored devices on /peers
i2psnark: Don't announce more than torrent size as downloaded amount
Tunnel fragments:
  - more checks, don't allow fragment #0 in follow-on fragment
  - Set message ID in constructor
Streaming:
  - Fix uncaught exception when log level = WARN, broken in -23
log tweak