v0.2.0

Added

• Link local peer discovery over IPv6. The system will automatically detect peers on the same LAN and try to connect to them.
  This makes sure peers on the same network don't needlessly use bandwidth on external "hop" peers.
• Data packets now carry a Hop Limit field as part of the header. Every node decrements this value, and if it is decremented
  to zero, the packet is discarded
• Intermediate nodes can now send ICMP packets back to the source in
  reply to a dropped packet. This is useful if a hop does not have route
  to forward a packet, or the hop count for a packet reaches 0.
• Local node now returns an ICMP Destination unreachable - no route if a
  packet is sent on the TUN interface and there is no key for the remote
  address (so the user data can't be encrypted).
• Peers connected over IPv4 now incur a higher processing cost, causing
  IPv6 connections to be preferred for forwarding data.
• Peer addresses now include a protocol specifier, so multiple underlay
  connections can be specified in the future.

Changed

• The peer manager now tracks sufficient info of each connected peer to
  avoid going through the router every time to see if it needs to
  reconnect to said peers.
• We don't send the receiver nodes IP address in IHU packets anymore, as the packet is sent over a unicast link.
  This is valid per the babel rfc.
• Setting the peers on the CLI now requires specifying the protocol to use.
  For now only TCP is supported.
• Change --port flag to --tcp-listen-port to more accurately reflect
  what it controls, as well as the fact that it is only for TCP.

Removed

• Handshake when connecting to a new peer has been removed.