Fix value semantics issues.
Fix some FLANN assertions.
Rework test printers.
Implement Graph, VertexListGraph for dist_index
Add EdgListGraph stubs for dist_index
Add dist_index cache.
Model EdgeListGraph in StarMap::dist_index
Model IncidenceGraph in StarMap::dist_index
Model PropertyGraph(Star, vertex_index_t) in StarMap
Model PropertyGraph(Star, vertex_index_t) in StarMap::dist_index
Implement StarMap::reachable
Implement StarMap::path()
Implement StarMap::connectedComponents
Use StarMap in scq
Remove SpatialIndex