[GUI] Haskell GUI examples

[George Russell]

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I took a few minutes (5) to implement the Haskell GUI example in HTk.  Code attached.

Forgive me for boasting but it seems clearer, simpler and shorter than any other of the examples
codings on John Meacham's website.  The closest competitor seems to be GIO.

This code should work (I haven't tested it) on any of Windows, Linux, Solaris and FreeBSD,
all of which we support.



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