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- Backported bpo-21423: Add an initializer argument to {Process,Thread}PoolExecutor
(only ThreadPoolExecutor for now; PR by Fahrzin Hemmati)

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- Backported bpo-24882: Let ThreadPoolExecutor reuse idle threads before creating new thread

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- The ThreadPoolExecutor class constructor now accepts an optional ``thread_name_prefix``
argument to make it possible to customize the names of the threads created by the pool.
Upstream contribution by Gregory P. Smith in https://bugs.python.org/issue27664.
- Backported fixes from upstream (thanks Lisandro Dalcin):

- python/cpython1560
- python/cpython3270
- python/cpython3830