make every comma-list inconsistent

this affects several examples e.g. TODO

```
Struct{t1: 1,
       t2: 2,
       t3: 3,
       t4: 4,}
->
Struct{t1: 1, t2: 2, t3: 3,
       t4: 4,}
```

well, both are actually useless!

TOOD: implement cbox comma-list