7.0 improve acc number completion

Improve the matching on acc_number by removing non alpha num characters when querying the res_partner_bank table

Comes from https://code.launchpad.net/~acsone-openerp/banking-addons/bank-statement-reconcile-70-improve-acc-number-completion/+merge/202861
You can use the other PEP8 alignment option to get less lines:
```
st_vals = st_obj.get_values_for_line(
    cr, uid, profile_id=profile_id, ...
    partner_id=partner.id...)
```