Babel Router

The resend logic has been made less aggressive, which should reduce the amount of routing traffic during network instabilities. A backward-incompatible change has been made: the -i flag no longer exists.

Major scalability improvements to the implementation (the protocol remains unchanged). Babeld should now handle networks with a few thousands of nodes with minimal CPU usage.

This version avoids a crash in some very unusual settings (running over a wireless interface where the channel is unknown).

This version is able to avoid interference by taking radio frequency into account when selecting routes. Minor tweaks and bugfixes are thrown in.

The default port number is now 6696, as allocated by IANA.