* Implement multi-scale indices generation. * Deduplicate values before sorting them while generating an index, to reduce the number of points to sort. * Use a hastable to deduplicate values, instead of a sort + dedup call. * Minor code cleanups
* Implement multi-scale indices generation. * Deduplicate values before sorting them while generating an index, to reduce the number of points to sort. * Use a hastable to deduplicate values, instead of a sort + dedup call. * Minor code cleanups