Pedigree does not check delete rights when offering to delete a patient record

When un-linking a patient record from a pedigree node the dialog that pops up now has a "delete patient record" button (note: in a non-prominent position)

When selected and approved, the delete request is made, and there is no check that the user has the right to delete the patient. This right can be different from the edit right (on some custom instances with custom authorisation module implementations), so the delete right should be explicitly checked per-patient