Add overloads for SpatialIndex functions
Add operator==() to Star
Add some test infrastructure
Add basic NeighborMap tests
Add some typedefs.
Add comparisons.
Add spatial index tests.
Fixup SpatialIndex::path
Use Stars rather than strings in NeighborMap
Remove unused member
Implement NeighborMap::add
Implement NeighborMap::nearestNeighbor
Implement NeighborMap::neighbors
Implement SpatialIndex::insert
Add getStar member
Implement SpatialIndex::nearestNeighbor
Implement SpatialIndex::reachable
Implement SpatialIndex::connectedComponents
Implement SpatialIndex::path