Wrong condition when looking for neighbors?

Hi. Thanks for the work.

I do notice something a bit strange in the method "Pathfinding3D/Assets/Pathfinding/Scripts/WorldManager.cs".

In the neighbors checking condition, you check if the considered point is not itself through the line :
` if (i == p && g == q && k == g)`

I believe this is incorrect and should be : 

 `if (p == 0  && q == 0 && g == 0)`

? 
