Update code according to standards

LICENSE

README.rst

__init__.py

__manifest__.py

models/__init__.py

models/account_config_settings.py

models/account_invoice.py

models/res_company.py

models/sale_config_settings.py

models/sale_order.py

static/src/less/account_lefilament.less

templates/report_devis_lefilament.xml

templates/report_facture_lefilament.xml

templates/report_layout_footer.xml

templates/report_layout_header.xml

views/account_config_settings.xml

views/lefilament_company_view.xml

views/lefilament_facture_view.xml

views/sale_config_settings.xml