operator< for Vertex added

Includes test

Path by Vishal Tiwari

git-svn-id: http://svn.osgeo.org/geos/trunk@3899 5242fede-7e19-0410-aef8-94bd7d2200fb
Simplify Vertext test

git-svn-id: http://svn.osgeo.org/geos/trunk@3900 5242fede-7e19-0410-aef8-94bd7d2200fb
Change operator< for Vertex to be inlined and use Coordinate operator<

git-svn-id: http://svn.osgeo.org/geos/trunk@3901 5242fede-7e19-0410-aef8-94bd7d2200fb