Can access speed optimisation

gives all together 35% in speed.

these commits:
//            $obj->load($row['task_id']);
//we have everything already loaded in $row.
//we only need to populate those fields of $obj that are used in canAccess
			$obj->task_id=$row['task_id'];
			$obj->task_access=$row['task_access'];
			$obj->task_owner=$row['task_owner'];