removed mesh wrapper class template and exposed meshes directly

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1117 fdac6126-5c0c-442c-9429-916003d36597
added a function that exposes type specific mesh member functions

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1118 fdac6126-5c0c-442c-9429-916003d36597
exposed TriMeshT functions

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1119 fdac6126-5c0c-442c-9429-916003d36597