- removed mface->puno flags, was only used to flip normals in display

and this is better left to user (whee this was a fun commit! so
   much deleting!)
 - removed mesh_calculate_vertex_normals (replaced by mesh_calc_normals)

source/blender/python/api2_2x/NMesh.c

@@ -2337,7 +2337,6 @@ static void mface_from_data( MFace * mf, TFace * tf, MCol * col,
 		test_index_mface( mf, i );
 	}
 
-	mf->puno = 0;
 	mf->mat_nr = from->mat_nr;
 	mf->edcode = 0;
 	mf->flag = from->mf_flag;