[MIG] contract: from v7 to v9 improving features

* Tests added
* Filters added.
* Add _id/_ids in old property fields
* Translations

contract/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+
+=================================
+Contracts for recurrent invoicing
+=================================
+
+This module forward-port to v9 the contracts management with recurring
+invoicing functions.
+
+Configuration
+=============
+
+To view discount field set *Discount on lines* in user access rights.
+
+Usage
+=====
+
+To use this module, you need to:
+
+#. Go to Sales -> Contracts and select or create a new contract.
+#. Check *Generate recurring invoices automatically*.
+#. Fill fields and add new lines. You have the possibility to use markers in
+   the description field to show the start and end date of the invoiced period.
+#. A cron is created with daily interval, but if you are in debug mode can
+   click on *Create invoices* to force this action.
+#. Click *Show recurring invoices* link to show all invoices created by the
+   contract.
+
+.. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
+   :alt: Try me on Runbot
+   :target: https://runbot.odoo-community.org/runbot/110/9.0
+
+Known issues / Roadmap
+======================
+
+* Recovery states and others functional fields in Contracts.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/contract/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed feedback
+`here <https://github.com/OCA/contract/issues/new?body=module:%20contract%0Aversion:%209.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Pedro M. Baeza <pedro.baeza@tecnativa.com>
+* Carlos Dauden <carlos.dauden@tecnativa.com>
+* Angel Moya <angel.moya@domatix.com>
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit https://odoo-community.org.