Roll Uncurry into Erasure

Making cpy recompute types uncovered errors in uncurry. In a nutshell,
the intermediate Apply nodes of a curried function were ill-typed, which
caused errors produced by TypeAssigner. These nodes were eliminated down the
road, but the errors are already issued.

I did not find a good way to treat uncurry as a treetransform. Since it is rather
trivial, it did not seem warranted to make it a full transformer either. So in
the end the uncurry functionality became part of erasure.

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