Baystation12/Baystation12 — pull request #1497 by Strumpetplaya (2012-07-20 12:47:11+00:00)
Title: Re-added atmos lockdowns and fixed three 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.
- Doors that are locked down by two different alarms should no longer
have their access permanently require engineering access.

Still known bugs
- Doors that are locked down by two different alarms will
lose lockdown status if only one of the alarms is cancelled.
- Atmos alarms don't always lock down every door they should.

Will get to the still known bugs later, as they require more work than just
correcting somebody else's minor mistakes, but at least atmos alarms
should no longer be potentially game-breaking.