proposal #2461: add Traversable generalizations?of?mapAccumL?and mapAccumR

[ross at soi.city.ac.uk]

Quoting Nicolas Pouillard <nicolas.pouillard at gmail.com>:
> I've also understood "<**> = flip <*>" when reading the docs :(

Clearly the docs need improving.  Does anyone have any comments on the
proposal itself?

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