Relax Point
This method takes five arguments: a point from the ready list, a point on a link that is a neighbor of this point, the ready list, the not ready list, and the distance between the point from the ready list and its predecessor point. It does the following:
- Determines that the point from the not ready list is close to a point in the ready list and returns.
- Determines that the point from the not ready list is close to a point in the not ready list