search: dump and share the best motion statistics for inter(P&B) slices
motion: remove unused sa8d pointer and bufSA8D method
frame: rename m_reconPicYuv -> m_reconPic, m_origPicYuv -> m_fencPic

the fooPicYuv names were potentially confusing, preferred names:
PicYuv* fooPic;
Yuv*    fooYuv;
api: add void to functions that take no parameters for -Wstrict-prototypes
encoder: use 6 frameNumThreads for cpucount 32 and above
cli: bug fix for validatefanout param analysis-mode=save and load