[ADD] contract_variable_quantity:

=================================================
Variable quantity in contract recurrent invoicing
=================================================

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

Configuration
=============

* Go to Sales > 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.

Usage
=====

To use this module, you need to:

* Go to 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).

contract_variable_quantity/__openerp__.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# © 2016 Pedro M. Baeza <pedro.baeza@tecnativa.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    'name': 'Variable quantity in contract recurrent invoicing',
+    'version': '9.0.1.0.0',
+    'category': 'Contract Management',
+    'license': 'AGPL-3',
+    'author': "Tecnativa,"
+              "Odoo Community Association (OCA)",
+    'website': 'https://www.tecnativa.com',
+    'depends': [
+        'contract',
+    ],
+    'data': [
+        'security/ir.model.access.csv',
+        'views/contract_view.xml',
+    ],
+    'installable': True,
+}