GeoGuideProject/geoguide

stdbscan implementation

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Implement the ST-DBSCAN for Geoguide, mouse-tracking implicit catch points
A: definition of time interval for cluster cration: < 10s
B: Intersection of cluster. Time interval (N) for creation of prefered regions : NxA
C: Save the intersection (by 2) from B.
D: Relation between the regions and the points in the dataset.

Ops, I should not have closed at c2feabf. It's just the implementation of ST-DBSCAN.