Changing tools scale bits to match codec.
Improves the PVQ RDO by using a better approximation for the rate.

Also, reduces the lambda.
Subset1 results are:
    PSNR -1.49235 0.11142
 PSNRHVS 0.731278 -0.0689038
    SSIM -3.19889 0.175489
FASTSSIM -4.4437 0.176714