Improve config description
Reduce rhizome MDP debug messages
Reduce frequency of mavlink heartbeat messages
Reduce size of rhizome sync announce packets
Ask for explanation of SIDs over point to point links
Bump rhizome idle timeout for congested links
Send a sync immediately on importing a new bundle
Add golay [12,24] FEC routines
Simplify packet debug logging
Improve mavlink packet synchronisation

- backtrack when decoding fails
- assume locally built heartbeats may split a valid remote packet
Use heartbeat packets to control serial buffering

- Improve simulation of fakeradio
- Backtrack on partial RS errors in case of truncation / heartbeat insertion
Send and track mavlink sequence number