[REF] porting v8 base_delivery_...label and affiliate modules

Seems to be near to be ready for merge
I already asked this question and think I got not answer.
The override of the order here is highly suspicious.

For the record, here is the one defined in `stock`:
```
 _parent_order = 'name'
_order = 'parent_left'
``` 
The order here is based on `parent_left` so I guess it is for respecting the tree's order.
Maybe you want to change the `_parent_order`, but what is the reason at a first place to change that in this module?

:-1: for that override