Can't extract buckets from Solid Fuel/Tartaric Aeroheater

[Kurtchekov]

Currently, there's no way to automate the removal of empty buckets from tartaric aeroheaters, not to mention that the empty buckets get consumed once the machine is done processing the lava.

[Lykrast]

At this point I'm really thinking about not allowing buckets of lava for the solid fuel and tartaric aeroheaters. Though if I do that I should probably check that there's an easily automatable fuel source to compensate.