Added quadtree
Modified geoPartitioning to do quadtree partitioning
Modified to be able to handle user assign
Modified to use quadtree not gmm
Modified to be tree structure
Moved read data function
Modified to calc center point for each area
Modified to handle new qtree
Modified params
Modified number_of_points -> number_of_points()
aa
Added field center to Area class
Merge branch 'quadtree' of github.com:yamaguchiyuto/olim into quadtree
Modified to handle out of area points
Modified part related to population
Added set_id
Modified args of make_population
Modified to remove areas without points
Modified predict method
Modified self -> qtree