User friendly recovery menu --------------------------- Implements the spec in https://wiki.ubuntu.com/FriendlyRecovery "Plugins" can be added easily: * install a script in /lib/recovery-mode/options * recovery-mode will invoke it with "test" - it should return "0" and print its name on stdout - if it returns "1" here it will not be added to the reovery-menu * if the script is run with no parameters it should perform its action * when the script is done, the menu is built again