[IMP] energy_selfconsumption: invoicing energy delivered

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Changelog

• [IMP] energy_selfconsumption: new wizard invoicing_wizard to manually generate the invoices for the energy delivered selfconsumption projects.
• [IMP] energy_selfconsumption: action to invoice energy delivered contracts, can only be applied to the same period (start and end)
• [IMP] energy_selfconsumption: view of contracts grouped by period (start and end)
• [IMP] energy_selfconsumption: contract io.cron will not get contracts related to energy delivered projects.
• [IMP] energy_selfconsumption: contract.contract will now save last period invoiced.

energy_selfconsumption/wizards/invoicing_wizard.py

@@ -33,6 +33,14 @@ Next period end: {next_period_date_end}"""
                     )
                 )
 
+    @api.constrains("power")
+    def constraint_power(self):
+        for record in self:
+            if not record.power or record.power <= 0:
+                raise ValidationError(
+                    _("You must enter a valid total energy generated (kWh).")
+                )
+
     def generate_invoices(self):
         return self.with_context(
             {"energy_delivered": self.power}