Buff radweed's AoE by one

[Archenteron]

Currently, radweed only irradiates shit immediately next to it. If it could reach an extra space out, all manner of creative hazards and/or deathtraps could be made with it.

[Erev]

I'd like to be able to do more with radweed in general. Things like higher potency increasing the area of effect. The ability to somehow harvest it (or at least spread that particular specimen to adjacent containers). More mutations (I think we have fire... how about healing?)