* Fix HFR Oxygen based iron content mitigation
Oxygen as an ameliorator for iron content buildup was added in 874914528.
However, the values used removed a breathtaking 50 percentage points of
iron content per tick (!) (note iron content is capped at 100 percentage
points!), at a cost of only 10 moles of Oxygen.
The overall effect is that non-debug HFR setups incidentally create
enough Oxygen to offset any iron content, and rarely risk meltdown.
This changes the values so that Oxygen is exactly enough to prevent
expected iron content buildup at fusion level 5, and slows buildup at
fusion level 6 to a mere 17% of the usual rate.
Oxygen consumed is now exactly proportional to the amount used to remove
iron, and delta_time is respected as well.
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