The previous broadcast model is replaced by a query-response one.
During normal operation, the cache of peers is not used anymore to select
peers to connect to. It now only used for bootstrapping and avoid querying
an already known address.

remove some unecessary info when connecting to the server

A lot of bug fix

Removing of the bandwidth calculation

When 2 tunnels are estabilshed between the same 2 peers, one of them is deleted

Remove the refresh-rate option

Added new simulation results.

Check for dead tunnels evry 5 seconds instead of waiting for the next tunnel_refresh

openvpns and babeld should now exit correctly

Fix in registry.py to speed up libxmlrpc (it was causing a 5s delay on each request for me on)

declare and populate are now separated so we can redeclare the external IP when it changes and get new peers when they are too few