Re-added atmos lockdowns and fixed two bugs with them. - Doors that are open when a lockdown occurs should no longer have their   access permanently require engineering access. - Doors that are open when a lockdown is cancelled should no longer be   stuck in a lockdown state. Still known bug - Doors that are locked down by two different alarms will lose lockdown status if only one of the alarms is cancelled.
Re-added atmos lockdowns and fixed two bugs with them.
- Doors that are open when a lockdown occurs should no longer have their
  access permanently require engineering access.
- Doors that are open when a lockdown is cancelled should no longer be
  stuck in a lockdown state.
Still known bug - Doors that are locked down by two different alarms will
lose lockdown status if only one of the alarms is cancelled.

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