Added test for self-intersecting polygons.
Added test for self-intersecting polygons.

svn path=/trunk/libavg/; revision=4444

scotty007/libavg,hoodie/libavg,yyd01245/libavg,th3infinity/libavg,th3infinity/libavg,th3infinity/libavg,th3infinity/libavg,yyd01245/libavg,libavg/libavg,scotty007/libavg,hoodie/libavg,hoodie/libavg,yyd01245/libavg,yyd01245/libavg,scotty007/libavg,libavg/libavg,hoodie/libavg,libavg/libavg,scotty007/libavg,libavg/libavg