Modified prediction behavior for reference frame.
Trial of a modified prediction function that ranks each possible reference frame based on a combination of local usage and frame level probability. The code is a bit cleaner and simpler. In direct comparison with old unpredicted method with segment level coding turned off for mode,ref & EOB the prediction gives a gain on derf of around 0.4%. There is some further gain from bug fixes over earlier code. With segment coding on the prediction method is slightly -ve on some very easy clips (at low rates) due to slightly higher overheads, but better on harder clips. Overall neutral on derf in direct comparison on latest code base, but compared to earlier code without bug fixes about +0.7% overall psnr +0.3% SSIM. Change-Id: I5b8474658b208134d352d24f6517f25795490789