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Better polar decode

Thomas Laurent requested to merge better-polar-decode into develop

Simplify the code
prevent to use "beta" tables from one decoder run to the next one (to see it is the case, don't initialize beta, you will see it doesn't decode)
decrease memory footprint of the decoder by x10 or more
save about 15% of cpu in polartest unitary test tool, and more if we run in realistic use case

still this decoder performs much worse than the (very) slow OAI version by 3dB

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