[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/views/contract_views.xml

@@ -5,7 +5,7 @@
             <field name="name">energy_selfconsumption.contract.tree</field>
             <field name="model">contract.contract</field>
             <field name="arch" type="xml">
-                <tree string="Contracts">
+                <tree string="Contracts" expand="1">
                     <field name="partner_id" />
                     <field name="supply_point_name" />
                     <field name="code" />