Access to selected functions found in 'liblwgeom' <https://github.com/postgis/postgis/tree/svn-trunk/liblwgeom>, the light-weight geometry library used by 'PostGIS' <http://postgis.net/>.
copied from cf-staging / r-lwgeomAccess to selected functions found in liblwgeom, the light-weight geometry library used by PostGIS