Change specs of connect

[Chat-Wane]

connect(from, to) should be extended so from and to are lists of peer ids. The old behavior should still be supported.

Why? Peers in overlay network usually connect/disconnect to more than one peer at a time. Using the current connect version, from may initiates multiple WebRTC connexions to a peer at once when 1 connexion was enough. The modification makes such cases easy to detect.