The system fields 'Created' and 'Changed' will now be displayed alongside the fields of a document

The system fields Created by [sys_gebr_aanm], Created on [sys_dat_aanm], Created at [sys_tijd_aanm], Changed by [sys_gebr_wijzig], Changed on [sys_dat_wijzig], and Changed at [sys_tijd_wijzig] will now be displayed alongside the fields of a document.