Migration to version 16.0

[sbidoul]

Todo

https://github.com/OCA/maintainer-tools/wiki/Migration-to-version-16.0

Modules to migrate

• [x] agreement_rebate_partner_company_group - By @stefan-tecnativa - #980
• [x] contract - By @wpichler - #887
• [ ] contract_invoice_start_end_dates - By @JesusValdez96 - #950
• [ ] contract_mandate - By @adriapalleja - #1070
• [x] contract_payment_mode - By @carolinafernandez-tecnativa - #996
• [ ] contract_price_revision - By @houzefa-abba - #1038
• [x] contract_queue_job - By @luisDIXMIT - #1077
• [ ] contract_sale - By @CRogos - #949
• [ ] contract_sale_generation - By @JesusValdez96 - #955
• [x] contract_variable_quantity - By @carolinafernandez-tecnativa - #1027
• [x] product_contract - By @Rad0van - #959
• [x] subscription_oca - By @carolina-domatix - #1029

Missing module? Check https://github.com/OCA/maintainer-tools/wiki/%5BFAQ%5D-Missing-modules-in-migration-issue-list