empty conn; clean_pcd using OPTICS, excl noise with a bit optimization; 10 cores

empty conn; clean_pcd using OPTICS; 16 cores

empty conn; clean_pcd; 10 cores

[test]No numba; full; 16 cores

import pathlib

slow loops

add numba wheel locally

add pip numba

Duplicate from usm3d/handcrafted_baseline_submission