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

Conflicts:
	TODO

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

Added exception catching in db, and modified utils.log so tht it can be used with anything ( and not only a string )

Conflicts:
	TODO
	tunnel.py

openvpns and babeld should now exit correctly