Add thread safety#38

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DrDaveD wants to merge 4 commits intofermitools:masterfrom

DrDaveD:simple-thread-safety

Commits on Jul 29, 2022

add thread safety
Dave Dykstra
committed
move gunzip state into memdata structure
Dave Dykstra
committed
enable pthread error checking and FRONTIER_LOG_LEVEL=thread
Dave Dykstra
committed
allow parallel threads while unpacking data
Dave Dykstra
committed