Change compareSubImg_thr_sse2 to use the intrinsic method _mm_sad_epu8 #99
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Change for how SAD (Sum of Absolute Differences) is computed in the SSE optimized path. There is a built-in intrinsic for computing SAD (PSADBW). By switching to the intrinsic, we see improvement in motion estimation/detection performance by 2x. All current tests pass -- maybe more tests are needed.