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Cross validation and comparison splits
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Don't wait for threads to finish in br::context::finalize, this will typically be called from a thread-pool thread, so this is a self-blocking wait. Create the mutex in br::context::messageHandler in recursive mode, this allows qDebugs inside the message handler to work.
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Updated threading for stream, updated waiting for parallel work to finish
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Release a thread from the global thread pool whenever we wait for a parallel job to finish. This means we don't waste one of the global thread pool's threads, and can maintain full CPU utilization.
