Draft: Resolve "test ThreadPool"

Closes #4 (closed)

assigned to @noemien.maillard

added 4 commits

• 9be1b788 - sort with natsorted instead of sorted (numerical order from 0 to n)
• 9502ac60 - update Pool to ThreadPool from multiprocessing.pool library
• fd525b2a - processes use deleted. script runs on cpu_count() from os library
• bb2f7b8d - changed chr_dirs for Sscrofa run and deleted unused lines/options

Compare with previous version

closed