[theora] NHW Project - high compression -l4 setting

[Raphael Canut]

Hello,

For those interested, I have added a -l4 high compression setting to the
NHW codec ( http://nhwcodec.blogspot.com/ ).This setting is very
experimental, I have boosted the sharpness for this one, but it can lack of
precision on low contrast areas.

This setting still maintains a good neatness and when it will be validated,
I will then make a new 0.1.4 version for the NHW Project.

High compression is really complex.Any help is welcome.

Cheers,
Raphael
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