[Haskell] Linear Equation Solver Using Arrays

[Xiao-Yong Jin]

Dear Haskellers,

My thanks to people on the irc channel, especially `int-e'.
With their help, I managed to write a linear equation solver
using STUArrays.

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It is basically a direct rewrite of a C version, which
adopts Crout's LU decomposition method with implicit
pivoting, in chapter 2.3 of the book Numerical Recipes.

I must admit that the code is in a really bad style,
somewhat ugly, because of the limit of my Haskell knowledge.
The code is attached in this email for your amusement.  I
would be really thankful if you can give me any kind of
comments, idea, improvement, criticism, because I sincerely
want to make the code better.

Best regards,
Xiao-Yong
-- 
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    <\     * (__
    */\      <