Entropy: Replaced getCtxQtCbf() with table
entropy: cleanup codeCUTransQuantBypassFlag
entropy: cleanup codePredMode
quant: use table for ctxCbf
entropy: cleanup codeQtRootCbf

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extra : amend_source : 503f35d5a7210cd612245469e8ac4c26e31e9c07
cmake: fix BSD link, only link with librt if it exists (closes #75)

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branch : stable
version: detect OpenBSD for version string (closes #76)

Fix from Brad Smith

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branch : stable
Merge with stable
Merge