[theora] NHW Image codec - 2 lower quality settings

[Raphael Canut]

Hello,

I have finally added 2 lower quality settings for the NHW codec: -l1 (-5Ko)
and -l2 (-10Ko).I use a quantization of 0.935 and 0.88 (kind of
quantization), and I decrease residual coding on the first order wavelet
image.

I have updated the demo page: http://nhwcodec.blogspot.com/ .

These 2 lower quality settings are still experimental.If you could find
time, would be interested in any opinion on this approach, and if it could
be acceptable or not? Because lower quality settings seem quite difficult
with my algorithm... -I prefer not remove higher wavelet coeffs for these 2
settings...-

Many thanks,
Raphael
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