Rewrite parallel DD based on futures #44
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Use thread-based futures for parallelism. Theoretically, we could suffer a performance hit caused by the GIL, if tests were performed in-process, but in practice, tests are usually executed in/by subprocesses anyway. Thus, it is superfluous to start a subprocess only to start up another subprocess.
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Use thread-based futures for parallelism. Theoretically, we could suffer a performance hit caused by the GIL, if tests were performed in-process, but in practice, tests are usually executed in/by subprocesses anyway. Thus, it is superfluous to start a subprocess only to start up another subprocess.