+* print error if /etc/mtab is not a symlink to /proc/self/mounts
+
* oneshot services which do not remain: 'exited' instead of 'dead'?
it should be visible in 'systemctl' that they have been run
* we now order plymouth after udev-trigger. Can we optimize this?
+* drop tmp.mount
+
External:
* patch kernel for xattr support in /dev, /proc/, /sys and /sys/fs/cgroup.