Merge lp:~vauxoo/openerp-mexico-localization/7.0-datetime_copy_dev_luis into lp:openerp-mexico-localization/7.0

[Luis Torres - http://www.vauxoo.com]

Se agrego la funcion copy, para que cuando se duplique una factura, en la nueva no coloque las fechas de factura, ni la de facturaE.

=== modified file 'l10n_mx_invoice_datetime/invoice.py'
--- l10n_mx_invoice_datetime/invoice.py	2013-09-08 04:28:04 +0000
+++ l10n_mx_invoice_datetime/invoice.py	2013-09-18 00:09:56 +0000
@@ -105,6 +105,12 @@
         if res:
             vals.update(res)
         return super(account_invoice, self).write(cr, uid, ids, vals, context=context)
+        
+    def copy(self, cr, uid, id, default=None, context=None):
+        if default is None:
+            default = {}
+        default.update({'invoice_datetime': False, 'date_invoice' : False})
+        return super(account_invoice, self).copy(cr, uid, id, default, context)
 
     def assigned_datetime(self, cr, uid, values, context=None):
         if context is None: