fix an off-by-one issue in the output JSON
use shrink_to_fit() instead of swap trick
properly compute sharing of nodes in search space with packed shortest path
Fix missing include in BinaryHeap
Add initial test for BinaryHeap
More complete BinaryHeap test
Fix typo in RangeTable
Test constructor of rangetable
Also test multiple blocks
Added RangeTable serialization test
Fix small errors in StaticGraph
Added test for StaticGraph
Make COORDINATE_PRECISION constexpr
Inititial version of StaticRTreeTest
Updated StaticRTree test
Make fstream non-static and StaticRTree thread-specific instead
Make tuning constants template agruments in StaticRTree
Updated StaticRTree test
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 element_count type