[theora] NHW Project - new -l8 "very high compression" setting

[Raphael Canut]

Hello,

For those interested, I have added a -l8 "very high compression" setting to
the NHW Project.

I have added an experimental processing to remove details and preserve
neatness.I have also now a fast estimation of entropy of wavelet
coefficients and I use it accordingly to the image complexity but it is a
very first version... With these new processings, the entropy coding
schemes are less efficient, and so we could save for -l8 setting nearly 2KB
per compressed .nhw file in average, will have to improve them...

This new -l8 setting has so a good neatness to the detriment of details.It
is still experimental, but I find it competitive with x265 (HEVC).

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

Any feedback is very welcome!

Cheers,
Raphael
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