[12.0][IMP] - add new option: create_new_line_at_contract_line_renew

Add a company config option to decide whether to create or to extend contract
line at renew action

contract/models/res_config_settings.py

@@ -0,0 +1,19 @@
+# Copyright 2019 ACSONE SA/NV
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+
+    _inherit = 'res.config.settings'
+
+    create_new_line_at_contract_line_renew = fields.Boolean(
+        related="company_id.create_new_line_at_contract_line_renew",
+        readonly=False,
+        string="Create New Line At Contract Line Renew",
+        help="If checked, a new line will be generated at contract line renew "
+        "and linked to the original one as successor. The default "
+        "behavior is to extend the end date of the contract by a new "
+        "subscription period",
+    )