better formspecs

[The4codeblocks]

migrates machines to real coördinates and touches them up with a few refinements

• battery box
• generic (base) machines
• fuelfired generators
• mcl compat
• (?) self-contained injectors

[The4codeblocks]

machines/register/machine_base.lua:214: attempt to index field 'button_base' (a function value)

huhh?
explain (it's a string on my copy)

[OgelGames]

I have no clue, but it seems like a mineunit issue, because it works locally.