frameencoder: remove obsolete check
TComDataCU: nits
compress: remove floating point math to avoid needing to use EMMS
weight: ensure weight table is initialized on failure, simplify weightAnalyse()
compress: nit comment spacing
frameencoder: re-use a single bitstream object for all NAL and SEI

This saves on malloc/free/realloc/memcpy calls.
compress: add EMMS at return of xCompressInterCu

Removed the EMMS from xComputeCostMerge2Nx2N since it is only called from the CU
compress function and it is not using floats
rc: set isCbr flag to true only in vbv mode and maxrate equals bitrate
frameencoder: fix header case

Reported by Elyonta