Calculating range
Solved find nearest
Subimt for scoring
Removed comparator, was not able to copile on Coursera, take 2
Made field private, take 3
Return null if points set is isEmpty
Stop checking if duplicate on x, y when inserting

- nodes on range edges are now included in range
Dont add node if it is duplicate by the current dimension value

- widen search in region
Fixed null pointer when root node not initialized