These are recommended for use instead of the existing force_rhr
function, due to the variability in definition of the "right hand
rule" between different software applications. Using an explicit
force_polygon_cw/ccw function removes user confusion when the
results vary between different applications.
Forces polygons to follow the right hand rule, in which the area that
is bounded by a polygon is to the right of the boundary. In particular,
the exterior ring is oriented in a clockwise direction and the
interior rings in a counter-clockwise direction.
