Replaced rtree with cKDTree in _GeographicObjects
Replaced rtree with cKDTree in _GeographicObjects


Former-commit-id: 0f8b44b44c79c5b6d331145d4ac09ae3da00c1c5
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine