Initialize v18 branch

Rename *_usability modules to *_usability_akretion

product_manager_group_stock/__manifest__.py

@@ -22,6 +22,6 @@ This module has been written by Alexis de Lattre from Akretion <alexis.delattre@
     'data': [
         'security/ir.model.access.csv',
         ],
-    'installable': True,
+    'installable': False,
     'auto_install': True,
 }