Shred: Add recursion operations [PATCH]

[Amr Ali]

Hi,

I'm not sure if this was discussed before, but I've got tired from having to
work around the lack of native recursion within `shred`. So, attached is a patch
to add recursion, including documentation.

Let me know if there's anything that needs to be modified further. I've compiled
and tested shred, so far everything works perfectly.

Have a great day,
-- 
Amr Ali

coreutils_shred_recursion.patch
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