title: Mass invoices duplicate Odoo8
body: <p>Is there anyway to duplicate, or create, a bunch of invoices with xml-rpc?</p>
  
  <p>I try with the copy method of the Odoo ORMApi</p>
  
  <pre><code>invoices = call('account.invoice','search_read', [('type','ilike',"out_invoice")])
  
  for invoice in invoices:
  inv = invoice.copy()
  </code></pre>
  
  <p>How can I insert the new invoice int the db?</p>