Add module commission_simple and commission_simple_sale

Improve view inheritance in account_usability

commission_simple/models/res_company.py

@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 Akretion France (http://www.akretion.com/)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+
+from odoo import fields, models
+
+
+class ResCompany(models.Model):
+    _inherit = 'res.company'
+
+    commission_date_range_type_id = fields.Many2one(
+        'date.range.type', string='Commission Periodicity')