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

Tunnels are now refreshed correctly even when the number of connections to established calculated is not an integer

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

Conflicts:
	TODO
	tunnel.py
	vifibnet.py

Added some logs, added blacklist in db, added lan discovery through babel + automatic blacklisting of node routed through the LAN

Conflicts:
	TODO

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

You can flag peers ( in vifibnet ) so that they are chosen last when looking for a peer to connect to.

Conflicts:
	vifibnet.py

Conflicts:
	TODO
	plib.py

in upnpigd : now open a port in tcp too