* fix bugs in check a position inside the polygon
It is possible that the position `(iox, ioy)` to be checked with `iox == min_x`. This will cause a incorrect inside check.
* add a boundary condition for gridmap
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up
* Test code clean up