Initialize v18 branch

Rename *_usability modules to *_usability_akretion

delivery_usability_akretion/models/stock_picking.py

@@ -0,0 +1,12 @@
+# Copyright 2018-2022 Akretion (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 StockPicking(models.Model):
+    _inherit = 'stock.picking'
+
+    carrier_id = fields.Many2one(tracking=True)
+    carrier_tracking_ref = fields.Char(tracking=True)