[theora] NHW codec - precision improvement

[Raphael Canut]

Hello,

I have improved the 0.2.1 version of NHW.This is a minor fix in the
pre_processing, but this new version has a better precision.I did not touch
the neatness, as I don't want to oversharpen.

More at: http://nhwcodec.blogspot.com/

Cheers,
Raphael
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