theora - Apr 2018 - quality improvement of -l4, -l5, -l6 high compression settings

Hello,

Great news!!! I have really improved -l4,-l5,-l6 high compression quality
settings!

The NHW Project is now really competitive, I prefer it to x265 (HEVC) now
on many images!

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

I don't have touched the entropy coding schemes, and normally with good
improvements (I have some ideas), we can save 1.5Ko-2Ko per .nhw file.

Any feedback is very welcome!

Cheers,
Raphael
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