Add robustness to failure of python multiprocessing #133
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…esses running in a suexec environment
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Add robustness to failure of the Python standard multiprocessing module. This can happen for processes running in an
suexecenvironment on a commercial cloud server where files in/sysare not readable, and leads to very unhelpful error messages and deep tracebacks.The changes mean that if a thread pool can't be created then carry on in a single-threaded way.