rc: Bug fixes for ABR.

remove uninitialized local variables and use values from cfg.param.rc as required.

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branch : stable
extra : source : f8ab02273bdb8cfa271f7139a3208400bcfe1cd7
ratecontrol: use cfg->param.frameNumThreads directly; nit cleanups

--HG--
branch : stable
Eliminating decreament in pointer index in weightp primitives


could have been a source of possible crash

--HG--
branch : stable
encoder: auto-padding to min CU size and set conformance window

--HG--
branch : stable
ratecontrol: consistent comment style

--HG--
branch : stable
remove reduce register copy in FILTER_H4_w2_2 and FILTER_H4_w4_2 (update for linux build error)

--HG--
branch : stable
cleanup: remove unused getNumberOfWrittenBits() from TEncBinCABAC::getNumWrittenBits()

--HG--
branch : stable
cleanup:remove unused base class TEncBinIf

--HG--
branch : stable
cleanup: merge header operator from TEncCavlc into class TEncSbac

--HG--
branch : stable
cabac: improvement performance by use negative cabac counter

--HG--
branch : stable
Merge with stable

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extra : amend_source : eafa09247f4310e78c1005dbe1852ce9569dc882
intra-sse3.cpp: replace intraPredAng8x8 vector class function with intrinsic
intra-sse3.cpp: replace intraPredAng32x32 vector class function with intrinsic
intra: move 32x32 angular prediction function into non-vector portion
intra: rename intra-sse3.cpp to intra-ssse3.cpp

--HG--
rename : source/common/vec/intra-sse3.cpp => source/common/vec/intra-ssse3.cpp
pixel: converted some sad_avx2 vector class functions to intrinsic
slicetype: calculate weighted frame costs for Aq