[MIG] contract_variable_quantity: Migration to 12.0

contract_variable_quantity/readme/CONFIGURE.rst

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+#. Go to Invoicing > Configuration > Contracts > Formulas (quantity).
+#. Define any formula based on Python code that stores at some moment a
+   float/integer value of the quantity to invoice in the variable 'result'.
+
+   You can use these variables to compute your formula:
+
+   * *env*: Environment variable for getting other models.
+   * *context*: Current context dictionary.
+   * *user*: Current user.
+   * *line*: Contract recurring invoice line that triggers this formula.
+   * *contract*: Contract whose line belongs to.
+   * *invoice*: Invoice (header) being created.
+
+.. figure:: images/formula_form.png
+   :alt: Formula form
+   :width: 600 px

contract_variable_quantity/readme/CONTRIBUTORS.rst

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+* Pedro M. Baeza <pedro.baeza@tecnativa.com>
+* Dave Lasley <dave@laslabs.com>
+* Souheil Bejaoui <souheil.bejaoui@acsone.eu>

contract_variable_quantity/readme/DESCRIPTION.rst

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+With this module, you will be able to define in recurring contracts some
+lines with variable quantity according to a provided formula.

contract_variable_quantity/readme/USAGE.rst

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+To use this module, you need to:
+
+#. Go to Invoicing > Sales > Contracts and select or create a new contract.
+#. Check *Generate recurring invoices automatically*.
+#. Add a new recurring invoicing line.
+#. Select "Variable quantity" in column "Qty. type".
+#. Select one of the possible formulas to use (previously created).