added unit tests for the following circulators: vertex-vertex, vertex-face, face-vertex

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1009 fdac6126-5c0c-442c-9429-916003d36597
exposed the PolyMesh type

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1010 fdac6126-5c0c-442c-9429-916003d36597
exposed the remaining handle and circulator types

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1011 fdac6126-5c0c-442c-9429-916003d36597
added unit tests for the following circulators: vertex-edge, vertex-ihalfedge (incomplete due to missing mesh functions)

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1012 fdac6126-5c0c-442c-9429-916003d36597