A* implementation is too inefficient when the map is large

[bakhshalipour]

I was using your A* implementation. At line 208, you pass obsmap to verify_node function by value. This could be too inefficient with large maps, resulting in huge memory consumption and high run time. You may consider making obsmap a global variable or passing it by reference.

[onlytailei]

Thanks, will try to fix it.

[SalahEddineGhamri]

should be closed since it was fixed by #14