Implemented datapoint delete

datapoint.go

@@ -233,3 +233,10 @@ func DatapointRetrieve(id int, name string) (dp Datapoint, err error) { // {{{
 
 	return
 } // }}}
+func DatapointDelete(id int) (err error) {// {{{
+	_, err = service.Db.Conn.Exec(`DELETE FROM datapoint WHERE id=$1`, id)
+	if err != nil {
+		err = we.Wrap(err).WithData(id)
+	}
+	return
+}// }}}