implement rescue mode installation via -r

if you have an alix board and like to have a fallback safemode
system, you can use adkinstall with -r and install a kernel with
initramfs as a read-only never changing rescue image.
Grub will then installed on the same rescue partition on the
compact flash card, to avoid a broken system after grub upgrade.

System should always come up with the rescue system without any
dependency to the live system.

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