Further change to mv reference search.
This experimental change reorders the search so that all possible references that match the target reference frame are tested first and these in order of distance from the current block. These will usually be the highest scoring candidates. If we do not find enough good candidates this way we try non matching cases. These will usually be lower scoring candidates. The change in order together with breakouts when we have found enough candidates should reduce the computational cost and especially reduce the number of sort operations. Quality Results: Std Hd +0.228%, Hd +0.074%, YT +0.046%, derf +0.137% This effect is probably due to the fact that more distant weak candidates are now less likely to get "promoted" over near candidates even if they are repeated. Change-Id: Iec37e77d88a48ad0ee1f315b14327a95d63f81f6
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