cppcheck fixes


git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1074 fdac6126-5c0c-442c-9429-916003d36597
More cppcheck fixes in OM

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1075 fdac6126-5c0c-442c-9429-916003d36597
exposed the TriConnectivity class and fixed the mesh class hierarchy

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1076 fdac6126-5c0c-442c-9429-916003d36597