Fix GEOSPointOnSurface returning point on boundary (#623)

Ports SafeBisector for InteriorPointArea from JTS

git-svn-id: http://svn.osgeo.org/geos/branches/3.3@3782 5242fede-7e19-0410-aef8-94bd7d2200fb
Put NEWS entries for 3.3.9 where they belong

git-svn-id: http://svn.osgeo.org/geos/branches/3.3@3783 5242fede-7e19-0410-aef8-94bd7d2200fb