Read frames in parallel using multiple threads #65
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This PR introduces a change to the image file reader that is used by the
DICOMfileClientto read individual frames from multi-frame images. So far, frames have been read sequentially. Now, we'll use amultiprocessing.pool.ThreadPoolto read multiple frames in parallel. We use threads instead of processes, because the read operation is I/O bound rather than CPU bound and the GIL should thus not be a bottleneck.