Because monic VarFunctions are representable by FinFunctions, a lot of redundant code was eliminated by just treating the components of the AttrType parts the same as the Ob parts - the only care that's needed is to map over the components with AttrVar when constructing the ACSetTransformation components (and undoing this when going in the reverse direction).
This PR extends https://github.com/AlgebraicJulia/Catlab.jl/pull/808 to support negation / subtraction / implication for VarACSets.
Because monic VarFunctions are representable by FinFunctions, a lot of redundant code was eliminated by just treating the components of the AttrType parts the same as the Ob parts - the only care that's needed is to map over the components with
AttrVarwhen constructing the ACSetTransformation components (and undoing this when going in the reverse direction).