Supermatter Tweaks

SM now behaves the same in a space tile as it does in a vacuum. Being in space no longer removes the need for rad protection or mesons.

Fixes the way heat_capacity was being handled. The heat capacity was being clamped to a minimum of 1 so that when the SM was run with no coolant, the temperature was not being increased correctly.

Fixes the radiation range. For some reason the relation with power was set so low that the range would never go above 1 or 2 tiles, even if you ran the emitter continuously.

Tweaks the amount of power produced by the SM so that 400 kW is now the equivalent of what 4 MW was before.