Alternative hierarchy proposal.

[Johannes Waldmann]

Please mind the "style warning"
http://haskell.org/pipermail/haskell/2001-February/000473.html

> 	   MArray		-- (opt)
> 	   IOArray		-- mutable arrays in the IO/ST monads

MArray looks cryptic. Why not Array.Mutable, and similar.
There are a few more places where this applies.

Of course this is rather irrelevant to the layout discussion now.
But perhaps not, since it's the question of introducing
small sub-modules, or using name prefixes.
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