There were an error in previous query for moving only contracts with the mark checked,
but it's also more logic to move them, but remain them disabled.
* Remove incorrect oldname attributes.
* Add filter on partners for running contracts (+ a support o2m field for that).
* Cover more tables in model renaming + cleaner code using a loop.
* Don't copy contract lines, but rename table + copy contract records on pre.
* Contract code is now populated to "Reference/Description" field in invoice.
* Order on new contract model has been restored to the same as old analytic accounts.
[RMV] - Remove empty file
[IMP] - Update no_update cron after migration
[IMP] - move contract template recurrence info to line level
[FIX] - Fix contract line model description
[IMP] - Link contracts to analytic accounts
[FIX] - Fix pylint
[IMP] - Move chatter and attachments from analytic account to contract
[IMP] - Move account_analytic_id to contract line level
[IMP] - Improve version check in migration script
[IMP] - Move contracts followers from analytic accounts
[ADD] - Add mail.activity.mixin to contract.contract model
remove data drop from migration scripts
[12.0][FIX] - Fix _init_last_date_invoiced
fix flake8
[ADD] - Update contributors list
[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
