using mface->flag for both.
Also found that the cdDM_drawMappedFaces and cdDM_drawFacesTex_common could get normals mixed up when rendering hidden faces. because hidden/invisible faces used continue without advancing to the next normal.
continual script stuff, minor stuff..
fix for bad return in group.
Added back group.objects.append/remove but print deprectaed warning. also some epydoc changes.