[FIX] payment_ogone: amount rounding issue

The amount to pay must be sent without comma to ogone.
e.g., for 66.99 EUR, the amount sent must be 6699.

To do that, we simply applied 66.99 * 100, which
seems rather good.

However, due to the fact how floats are handled in computers,
`66.99 * 100` returns 6698.999999999999
and
`int(6698.999999999999)` returns 6698
while we expected 6699

Using `float_repr` with `0` as decimal precision
instead of using `int` solves this issue.
`float_repr(6698.999999999999, 0)` returns 6699, as expected.

addons/payment_ogone/models/ogone.py

@@ -15,7 +15,7 @@ from openerp.addons.payment_ogone.controllers.main import OgoneController
 from openerp.addons.payment_ogone.data import ogone
 from openerp.osv import osv, fields
 from openerp.tools import float_round, DEFAULT_SERVER_DATE_FORMAT
-from openerp.tools.float_utils import float_compare
+from openerp.tools.float_utils import float_compare, float_repr
 
 _logger = logging.getLogger(__name__)
 
@@ -141,12 +141,11 @@ class PaymentAcquirerOgone(osv.Model):
     def ogone_form_generate_values(self, cr, uid, id, partner_values, tx_values, context=None):
         base_url = self.pool['ir.config_parameter'].get_param(cr, uid, 'web.base.url')
         acquirer = self.browse(cr, uid, id, context=context)
-
         ogone_tx_values = dict(tx_values)
         temp_ogone_tx_values = {
             'PSPID': acquirer.ogone_pspid,
             'ORDERID': tx_values['reference'],
-            'AMOUNT': '%d' % int(float_round(tx_values['amount'], 2) * 100),
+            'AMOUNT': float_repr(float_round(tx_values['amount'], 2) * 100, 0),
             'CURRENCY': tx_values['currency'] and tx_values['currency'].name or '',
             'LANGUAGE':  partner_values['lang'],
             'CN':  partner_values['name'],