As discussed internally, commutative terms don't actually exist apart from equations. Remove the commutative bit and code that relies on it, instead checking for equations where it makes sense to do so.
While we're at it, also remove some dead code, tag #157.
As discussed internally, commutative terms don't actually exist apart from equations. Remove the commutative bit and code that relies on it, instead checking for equations where it makes sense to do so.
While we're at it, also remove some dead code, tag #157.