if f-values are equal (<0.0001) compare h-values #98
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Comparing h-values (heuristic to target) when f-values (overall cost) are equal. So nodes closer to the destination with the same f-value will be expanded first. This reduces the size of the open list and speedups pathfinding in A*, BiDi-A* and JPS. Looks very cute with A* and octile heuristics. MAX_DIFF (=0.000001) is used to compare the floats.