If an atom got spacewind;ed from a simulated turf to another simulated turf that was later on in the processing queue, and was set to space wind to a unsimulated turf, it would space wind those atoms twice in one fire of SSair.
Unsimulated turfs can't check for the air cycle at share time, because they themselves do not fire, so we have to move the check to the atoms.
This also fixes a few other minor edge cases in space wind, or at least i think it does, from tracing the code.
Kyle Spier-Swenson
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