Provide begin/end functions for circulators for direct access
git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@254 fdac6126-5c0c-442c-9429-916003d36597
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git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@254 fdac6126-5c0c-442c-9429-916003d36597