Implement names for constrained variables

[blegat]

Dualization.jl/src/dual_equality_constraints.jl

Lines 177 to 181 in 95410dd

	if !is_empty(dual_names)
	@warn(
	"dual names for constrained vector of variables not supported yet."
	)
	end

See https://discourse.julialang.org/t/cant-get-the-example-dualization-to-work/129478/2?u=blegat