title: odoo 9 migrate binary field db to filestore
body: <p>Odoo 9 custom module binary field <strong>attachment=True</strong> parameter added later after that new record will be stored in filesystem storage.
  Binary Fields some old records attachment = True not used, so old record entry not created in ir.attachment table and filesystem not saved.
  I would like to know how to migrate old records binary field value store in filesystem storage?. How to create/insert records in ir_attachment row based on old records binary field value? Is any script available?</p>