[REF] Contract Sale Invoicing: split from analytic account

[REF] Contract Sale Invoicing: update translations

[IMP] - Assert that the predecessor is available for new link at uncancel

[RMV] - remove usless changes

[RMV] - Remove usless field recurring_invoices

after the total isolation between contract model and account analytic one.
recurring_invoices which was used to mark analytic account as contract became usless

[IMP] - P3 syntax

[IMP] - use @openupgrade.migrate() and openupgrade.logged_query

[IMP] - drop transient table in migration script

contract_sale_invoicing/tests/test_contract_sale_invoicing.py

@@ -8,6 +8,8 @@ class TestContractSaleInvoicing(TestContractBase):
     @classmethod
     def setUpClass(cls):
         super(TestContractSaleInvoicing, cls).setUpClass()
+        cls.contract.analytic_account_id = \
+            cls.env['account.analytic.account'].search([], limit=1)
         cls.product_so = cls.env.ref(
             'product.product_product_1')
         cls.product_so.invoice_policy = 'order'
@@ -21,7 +23,7 @@ class TestContractSaleInvoicing(TestContractBase):
                                    'product_uom': cls.product_so.uom_id.id,
                                    'price_unit': cls.product_so.list_price})],
             'pricelist_id': cls.partner.property_product_pricelist.id,
-            'analytic_account_id': cls.contract.id,
+            'analytic_account_id': cls.contract.analytic_account_id.id,
             'date_order': '2016-02-15',
         })