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Draft: Add Foldable and Traversable instances for tuples

Tobias Haslop requested to merge tobias/ghc:foldable-traversable-tuple-instances into master

Add Foldable and Traversable instances for tuples

See https://github.com/haskell/core-libraries-committee/issues/206 for discussion.

Add Foldable and Traversable instances for tuples with up to 7 components.
Specifically this commit adds instances for tuples with 3 to 7 components.

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