Non-normative quality improvements to CLPF.

BDR improvements:
     PSNR  PSNRHVS SSIM  MSSSIM CIEDE2000 PSNR Cb  PSNR Cr
LL: -0.17% -0.13% -0.11% -0.12%   -0.18%   -0.19%   -0.21%
HL: -0.21% -0.14% -0.15% -0.11%   -0.37%   -0.39%   -0.52%

Change-Id: I58c00a1cc0ddfc3376644f66345e99472482a613
2 files changed