Update .xyz file format to include element and atom files

src/io.f90

@@ -133,14 +133,14 @@ module io
         do i = 1, ele_num
             do inod = 1, ng_node(lat_ele(i))
                 do ibasis = 1, basisnum(lat_ele(i))
-                        write(11, '(i16, 3f23.15)') basis_type(ibasis,lat_ele(i)), r_node(:,ibasis,inod,i)
+                        write(11, '(2i16, 3f23.15)') basis_type(ibasis,lat_ele(i)), 0, r_node(:,ibasis,inod,i)
                 end do 
             end do 
         end do 
 
         !Write atom positions
         do i = 1, atom_num
-            write(11, '(i16, 3f23.15)') type_atom(i), r_atom(:,i) 
+            write(11, '(2i16, 3f23.15)') type_atom(i), 1, r_atom(:,i) 
         end do
 
         !Finish writing