grub_file branch: generating grub.cfg for other installs, filtering unrelated files

[Vladimir 'φ-coder/phcoder' Serbinenko]

Hello, all. I've done some experiments in checking in grub-mkconfig
where the files are valid kernels in order to distinguish between e.g.
xen-capable and not capable kernel. As a bonus it's able to generate
grub.cfg for a mounted OS even if it doesn't have the same
architecture.. There are still some problems when running and target OS
are different. E.g. UUID check in 10_linux.in or using GRUB_DEVICE as a
fallback.

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