[meta] update changelog, version info & release history

[meta] update version info & readme

[meta] update changelog, version info & release history

[meta] add geom-voxel module to meta geom project.clj

[meta] update version info & changelog

[core] [types] breaking change update to quadtree & octree

- update tree impls to use points as unqiue keys w/ attached data values
- update PSpatialTree protocol, split out PTreeOps (in spatialtree ns) for non-public ops
- update tree selection fns to return stored values, not the points they're indexed at
- update org structure of spatialtree ns

[all] update version info & release history

update release history