Haskell API for memory useage

[Neil Mitchell]

Hi Bernie,

> I once write a little thing called HighWaterMark:
>
>    http://www.cs.mu.oz.au/~bjpop/code.html
>
> It is GHC specific, and it doesn't count memory allocated by foreign stuff
> (ie C stack etc).

That's great, a few more things and it would be perfect:

* darcs repo
* cabal based
* working with GHC 6.6 (if it doesn't already)
* portable to hugs, just returning Nothing on hugs and Just Integer on
GHC is perfect

Thanks

Neil