Initialize v18 branch

Rename *_usability modules to *_usability_akretion

product_usability_akretion/models/product_supplierinfo.py

@@ -0,0 +1,12 @@
+# Copyright 2015-2022 Akretion (http://www.akretion.com)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# @author Raphaël Valyi <rvalyi@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class ProductSupplierinfo(models.Model):
+    _inherit = 'product.supplierinfo'
+
+    partner_id = fields.Many2one(domain=[('parent_id', '=', False)], ondelete='restrict')