[theora] NHW Image codec - improvement of precision

[Raphael Canut]

Hello,

For those interested, I improved a little the NHW codec.Now I apply a
(fast) sharpening on U and V components before the 2x2 upsampling in the
decoder, which results in a better upsampling (+0.1dB for the PSNR...)
and gives a better precision to the image.I have also improved the
dequantization in the wavelet HH band.

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

Many thanks,
Raphael
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