theora - Mar 2018 - NHW Project - improvement of -l5 quality setting

Hello,

I have improved -l5 quality setting of the NHW codec.I have saved 1Ko on UV
chroma planes, and so I have raised quantization on Y luma plane from 0.845
to 0.87.

-l5 quality setting is now really better, has notably less artifacts.

There could be some light color distortion now on certain images, but
globally I really prefer this version (color distortion is less annoying).

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

This last version of the NHW Project starts to be very interesting, and I
would be really interested in any feedback if you have time!

Cheers,
Raphael
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