* support something like a directory /etc/grml/fai/packages to install
additional Debian packages without the need for a Debian repository
-* document the available classes in more detail
+* document the available classes in more detail (GRMLBASE, LATEX_CLEANUP,
+NO_ONLINE, REMOVE_DOCS, GRML_SMALL,...)
* add a check to make sure $TARGET is mounted rw,suid,dev?