protoboard: peer IDs should be supplied by the user

[vmatare]

Currently, peers are identified by count, and they are counted simply in the order in which the CreatePeerMessages are processed. This leads to a certain degree of uncertainty as to what peer will have what ID. One idea for a solution would be to give the peers a user-supplied string identifier.

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[morxa]

This just bit another group, as they used the wrong peer to send messages.