[IMP] XML import: float values are not passed as strings anymore

When you import a record from a XML file, values passed to float fields
are not casted as floats.

Eg: ``<field name="price">1.0</field>`` is parsed as '1.0' string.

The method _update from ir_model.py seems to accept these "fake floats"
strings BUT, if you override write() in a module, you can't guess that
values meant to be written in a float field are actually strings

Eg: The override of write() in sale.order.line expects a float and crash
at second install. (try twice `-i sale` in a 9.0 database)

In order to fix this, we apply the same reasoning than for integers
(two lines above).

openerp/tools/convert.py

@@ -704,6 +704,8 @@ form: module.record_id""" % (xml_id,)
                 if f_name in model._fields:
                     if model._fields[f_name].type == 'integer':
                         f_val = int(f_val)
+                    elif model._fields[f_name].type in ['float', 'monetary']:
+                        f_val = float(f_val)
             res[f_name] = f_val
 
         id = self.pool['ir.model.data']._update(cr, self.uid, rec_model, self.module, res, rec_id or False, not self.isnoupdate(data_node), noupdate=self.isnoupdate(data_node), mode=self.mode, context=rec_context )