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Be resilient against parallel directory creations. (#75)

* Be resilient against parallel directory creations.

When using multiprocessing, simultaneous writes can lead to the
situation where both code paths first check if the directory exists and
create it in the negative case. As check and creation aren't a single
atomic operation, one of them might fail.

* Add test case to check concurrent failure scenario

* Assert correct Error in Python 2

* Amend changelog

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