-* FILE_RC: instead of using systemd as init system use file-rc instead. file-rc
-was the init system used by Grml until and including stable release 2014.11,
-starting with beginning of 2016 Grml switched to systemd instead. If you want to
-build a live system in the old style using file-rc instead of systemd then enable
-this class. Please notice that support for file-rc is no longer being actively
-maintained (the Grml team happily accepts patches though) and file-rc (upstream
-wise) might disappear too.
-