rc: fix bug in predicting B frame bits in vbv

--HG--
branch : stable
TEncSearch: remove redundant function call
mbdst: use fixed buffer allocations, cleanup some tests
mbdst: add missing test of dequant_scaling
docs: fix a typo

--HG--
branch : stable
Merge with stable
intra: use fixed buffer allocations
testbench: move test benches from stack allocations to global
ipfilter: use fixed buffer allocations
pixel: use fixed buffer allocations
mbdstharness: remove completely unused arrays
mbdst: remove unused mbuf4, rename other short output buffers
mbdst: remove redundant mintbuf buffers
mbdst: reshuffle varnames
mbdst: fix memset lengths, change MEM_CMP_SIZE to MAX_TU_SIZE
mbdst: align buffers to 32byte boundary
test: fix MSVC warnings
mbdst: make buffers nice even size
mbdst: cleanup dequant test