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.

A peer now advertise itself more at the begining to be as present in the local db of other peers than the average

Currently, a peer broadcast its address to evrybody but this should change

    When the bootpeer was blacklisted, it was still inserted in the peers table
    When 0 tunnels had to be made, re6stnet asked for 0 unsed peers, recieved an empty list and thought he had to ask new peers 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.

I've akso changed the datastructure to bz able to see the graph evolve much faster

openvpns and babeld should now exit correctly

changes in tunnel.py to falg the dead peers
changes in db.py to remove old peers when necessary

in upnpigd : now open a port in tcp too

in plib.py : the address attributed to the server iface was XXXXX/len(network) wich resulted in XXXXXX/48 while it should be XXXXXX/len(subnet of a single machine)
in vifibnet.py : the -l option was broken
in tunnel.py : routes count is now stored on each connection object and not in the tunnelManager object