SS13/green — pull request #1 by Kreastr (2012-12-10 13:12:50+00:00)
Title: New way of transferring air between zones.

Now every zone can trigger group sharing. In group sharing the gases and temperatures are transfered based on average between all connected zones avoiding "slow transfer through bottlenecks" and processing order problems. The speed of transfer decays with total volume of connected zones.

The old way is kept to generate pressure differences for airflows.