Parallelize the LSS pipeline #61
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Ongoing PR to parallelize and speed up the LSS tasks.
Most tasks are already quite fast - the only bottleneck is
signal.corrfunc.corr_to_clarray, with the main bottleneck there being the calls toutil.cubicspline.SinhInterpolator. The interpolator is already openmp parallel, so adding MPI parallelization requires using multiple nodes to get any speed-up.