[IMP] sale: set default terms and condition for invoice

Purpose:
Sales general terms should be printed on the invoices when creating an invoice from scratch.
For the moment, the Terms and conditions are linked to the SO.

Moreover, Terms and Conditions are not copied for Down Payments invoices

Specification:
- If the source document is an SO, it should take the Terms and conditions of the SO
  (in all cases, also with down payments)
- If created from scratch, it should take the default Terms and conditions set on the company.

addons/sale/sale.py

@@ -905,7 +905,13 @@ class AccountInvoice(models.Model):
     def _get_default_team(self):
         return self.env['crm.team']._get_default_team_id()
 
+    def _default_comment(self):
+        invoice_type = self.env.context.get('type', 'out_invoice')
+        if invoice_type == 'out_invoice':
+            return self.env.user.company_id.sale_note
+
     team_id = fields.Many2one('crm.team', string='Sales Team', default=_get_default_team, oldname='section_id')
+    comment = fields.Text(default=_default_comment)
 
     @api.multi
     def confirm_paid(self):

addons/sale/wizard/sale_make_invoice_advance.py

@@ -93,6 +93,7 @@ class SaleAdvancePaymentInv(models.TransientModel):
             'payment_term_id': order.payment_term_id.id,
             'fiscal_position_id': order.fiscal_position_id.id or order.partner_id.property_account_position_id.id,
             'team_id': order.team_id.id,
+            'comment': order.note,
         })
         invoice.compute_taxes()
         invoice.message_post_with_view('mail.message_origin_link',