Avoid issue with silx compiled with OpenMP
This MR sets OMP_NUM_THREADS as early as possible. It was previously causing a freeze on debian8 when silx is compiled with OpenMP support and the median filter is used during QSpace conversion.
This MR sets OMP_NUM_THREADS as early as possible. It was previously causing a freeze on debian8 when silx is compiled with OpenMP support and the median filter is used during QSpace conversion.