* CDDM_calc_normals * CDDM_calc_normals_tessface these match what we have in trunk - CDDM_calc_normals_mapping() is kept for more comprehensive operatons.
* CDDM_calc_normals * CDDM_calc_normals_tessface these match what we have in trunk - CDDM_calc_normals_mapping() is kept for more comprehensive operatons.