[DFW.pm] hackathon - example code updates

[Tommy Butler]

If you are using the example code on github
<https://github.com/tommybutler/dupfind> as a basis for your own deduper
(which is fine), please make sure you pull down the changes from today. 
It's literally hundreds of times faster than it was before--the normal
as well as the multithreaded version.  The current state of the code is
as much as I'll optimize it.  No further changes to it will happen to it
other than bug fixes.  The rest... is up to you.

Happy new year to all.

--Tommy Butler
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