Add test for BinaryHeap
Fix typo in RangeTable
Add test for RangeTable
Fix small errors in StaticGraph
Added test for StaticGraph
Make COORDINATE_PRECISION constexpr
Make fstream non-static and StaticRTree thread-specific instead
Make tuning constants template agruments in StaticRTree
Change StaticRTree serialization constructor to static function

Since the constructor does not satisfy the requirements for a
constructor (the RTree is not properly initialized) make it a
static function instead.
Fix GetMinDistance
Add test for StaticRTree