Partial partition detection and handling (where by "handling" we mean "promotion to full partition"). This necessitates that we hold GUIDs for each node (so that we can detect if a node has restarted behind our back).
In the event of a partial partition in pause_minority mode, pause until everything comes back - otherwise we stand a chance of just reconnecting and still being in a partial partition.
Allow requires / enables to be multiple steps, reduce ugliness.
Merge bug 26213
Distinguish between "already stopped" (fine, carry on) or "already down" (abort since we've lost contact).
Merge bug26368 (again)