Fixed threadpool hang and added lots of smoketests. * Fixed bug in threadpool logic when calling CleanupAnyWorkersSharingAllocator - this was deleting the worker's thread death notifier in the context of a worker thread (which is only allowed from the context of the main thread). * Added lots more smoketests * Added --overwrite option to fzip (previously unzipping would always overwrite)

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And so on and so on