Add some checks for 'free' nodes that are not allocatable. * db/audit.in: Include the list of nodes that are not reserved but have an eventstate that makes them unallocatable. * www/dbdefs.php3.in: Add POWEROFF and ALWAYSUP node states. * www/nodecontrol_list.php3: Add an asterisk next to the free count for type(s) that have free, but unallocatable nodes. * www/shownodetype.php3: If a node is free, but unallocatable, put a yellow ball next to its name instead of a green one.