Add the function containsPoint
Correction to the function containsPoint
Optimisation of the printf to check a polygon
Check the containsPoint function

Add a test Point and print if the point is are is not in the Polygon
Create a more complicated polygon
The last point of the polygon is now computed
Manage the case of y=y

This is when the virtual line cross an edge so the inpoint.y and inpoly....y are equal. So this fix this case.