Convert wiring diagram to morphism expression in monoidal category #35
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Not fully implemented and not tested.
This was a hack.
We can now get expressions for *some* morphisms in a monoidal category.
In general, this can fail to overlapping parallel subgraphs. More thought is needed. (Under the previous, strict version, overlaps are not possible.)
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A first attempt to convert wiring diagrams to syntactic expressions. I think, but have not yet carefully checked, that this algorithm, inspired by the literature on series-parallel digraphs, will handle any wiring diagram that represents a morphism in a monoidal category.
Symmetric monoidal categories do not yet work. For that, I need to implement a piece of the computational group theory for the symmetric group, but I defer that to a later PR.