Mapping speed improvement#791

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suhrig wants to merge 2 commits intoalexdobin:masterfrom

suhrig:mapping_speed_improvement

Commits on Dec 7, 2019

improve mapping speed by avoiding calls to memset for winBin
suhrig
committed

Commits on Dec 8, 2019

minor speed improvement: unpack PackedArray using bit mask instead of bit shifting
suhrig
committed