* lipshitz_octree tutorial example
* better comments
* revert to shallow default
* better names and documentation, dont return I
* long long -> std::int64_t
* asdd tutorail chapter 10
* precious windows
* int64_t -> std::int64_t
* batch version
* fix template chain from overzealous index typing
* bump to c++17 (if constexpr)
