Arity-generic decorators in Haskell

This started out as a fancy Haskell call-tracer and was then generalized to a Haskell decorator library.

The current, generalized library is described in a rejected ICFP Functional Pearl.

Older documentation describes the earlier, call-tracing focussed library:

• Proof-tree Stack Overflow example

• Slides from PSU PL Club presentation

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