fn:deep-equal implementation

Hi,

I've implemented fn:deep-equal, as I need it for my current project.  The
implementation, some unit tests, and a patch to add the function to the
table of built-in ones are attached.  It seems to work, but I didn't try
it with very complex queries (I'm especially worried about
getDependencies() and inPredicate, since I have no idea how they work),
and I didn't try to optimize it in any way.  Any feedback would be
appreciated.  Thanks!

                -- P.

--
  Piotr Kaminski (piotr@xxxxxxxxxxxx)
  It's the heart afraid of breaking that never learns to dance.

FunDeepEqual.java
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DeepEqualTest.java
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deep-equal-patch.txt
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smime.p7s
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