mathlib

84cbbc98 - feat(algebra/group/to_additive + a few more files): make `to_additive` convert `unit` to `add_unit` (#12564)

feat(algebra/group/to_additive + a few more files): make `to_additive` convert `unit` to `add_unit` (#12564) This likely involves removing names that match autogenerated names. Co-authored-by: Alex J. Best <alex.j.best@gmail.com>