Need to find a proper solution for OUCoupllingBlox

[david-hofmann]

OUCouplingBlox does not work with the system_from_graph setup. jcn cannot be accessed if it isn't part of the system. I can probably be made part of the system even without being part of the equations (check documentation)

One workaround would be to define a linear blox, effectively an x ~ jcn. That would be akin to a math blox type solution. But this still seems a bit hacky.

Neuroblox.jl/test/components.jl

Line 271 in 9c605ec

@testset "OUBlox-OUCouplingBlox network" begin