Run mutants in parallel. #35
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This pr allows mu2 to run mutants in background threads. This implementation reduces the execution time of
cmu.pasta.mu2.diff.DiffITfrom 29.518 to 19.299s on my laptop.To enable parallel running you may pass
-Dmu2.PARALLEL=true. By default, mu2 will create the number of threads which equals to the number of logical cores you have.Note that thread timeout is only enabled when you have parallel running enabled. But we can also move this out and make it independent.