removed proxy code and exposed missing functions

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1081 fdac6126-5c0c-442c-9429-916003d36597
exposed skipping iterators

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1082 fdac6126-5c0c-442c-9429-916003d36597
added a unit test for iterators

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1083 fdac6126-5c0c-442c-9429-916003d36597
added 3 new unit tests (add_face, boundary, delete_face) and updated the property unit test

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1084 fdac6126-5c0c-442c-9429-916003d36597