grub-install hidden options weirdness

[Phillip Susi]

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A user complained that grub-install has some undocumented options such
as --root-directory.  I started looking into it and noticed a lot of
weirdness here.

1)  It seems that --root-directory used to just be used to find the
boot directory by appending "boot" to rootdir.  --boot-directory was
added as a more appropriate way to directly specify that.  Shouldn't
the man page mention that it still accepts --root-directory for
backwards compatibility but it's use is depreciated?

2)  It seems that --root-directory has been overloaded to specify the
efi system directory.  This seems like it was the wrong thing to do
and again, is totally undocumented.

3)  It appears that --grub-setup used to allow you to specify an
alternate program to run instead of grub-setup.  Now it seems to check
if its argument is "setup" and if so, has the same affect as
- --no-bootsector, and otherwise has no effect.  This seems completely
wrong.

4)  The similar arguments --grub-mkrelpath, --grub-probe,
- --grub-editenv, and --font are accepted and completely ignored.  If
the option no longer works, it should be removed rather than silently
ignored.  At least that way you don't have people using it and
wondering why it isn't working.

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