Adapt ARNR filter length and strength.
Adjust the filter length and strength for each ARF group based on a measure of difficulty (the boost) and the active q range. Remove lower limit on RDMULT value. Average gains on the different sets in range 0.4%-0.9%. However the ARNR changes give a very big boost on a few clips. Eg. Soccer ~5%, in derf set and Cyclist ~ 10% in the std-hd set Change-Id: I2078d78798e27ad2bcc2b32d703ea37b67412ec4
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