properly remove entire fermenter and reformer

[fluxionary]

after checking that they don't have contents.

add an LBM to remove top parts of the machines stranded by the current bug.

[fluxionary]

Hold on before merging, it also needs to check for protection too. Working on that now.

[fluxionary]

OK, seems to be working fine for me now.

However, I'm unsure whether the logic for removing the defective variants needs to call State:on_dig_node and tubelib.remove_node instead of minetest.node_dig (and this applies to single-node machines as well).

[joe7575]

You are right, the already defect node should not call State:on_dig_node (in order to possibly get defect again).
Good work, thanks.