7.0 pep8

I try to set some module in pep8, the PR is not complete.

It gives an idea of the avancement. If you have any advice, do not hesitate !
`osv` is imported to use `osv.except_osv` at https://github.com/acsone/account-financial-reporting/blob/7.0-pep8/account_financial_report/report/parser.py#L616

Please import `orm` and use `orm.except_orm`