Data is from
http://geographiclib.sourceforge.net/html/geodesic.html#testgeod

The solutiion we currently use in QGis is the Vincenty equations
( http://www.movable-type.co.uk/scripts/latlong-vincenty.html )
not the one implementeed in the geographiclibray library. Some testdata
(anitpodal) fails, and they are commented out.

For a thorough discussion, see 
C. F. F. Karney, Algorithms for geodesics, J. Geodesy, 2012; DOI: 10.1007/s00190-012-0578-z;
available here http://dx.doi.org/10.1007/s00190-012-0578-z

Magnus Homann 2012-09-02