[PD] proof-of-concept [hsext] for writing pd externals in Haskell

[Charles Henry]

I think I understand now.  This is quite a bit more complicated than I
had thought at first.

>  > Have I missed the point entirely?
>
> http://claudiusmaximus.goto10.org/gallery/coding/hsext/first-non-trivial.png
>
> The middle window in the top row is the entire source for the object.
> hsext provides the glue to load that source, with a large portion of
> rather non-trivial help from:
>
> http://www.cse.unsw.edu.au/~dons/hs-plugins/