* util/update-grub_lib.in: New file.
* DISTLIST: Add update-grub_lib.in.
* conf/common.rmk: Generate update-grub_lib and install it in
$(lib_DATA).
* Makefile.in: Add install routine for $(lib_DATA).
* util/grub.d/00_header.in: Use convert_system_path_to_grub_path()
function provided by update-grub_lib to support arbitrary paths of
unifont.pff.
* util/update-grub.in: Use convert_system_path_to_grub_path() to
initialize GRUB_DRIVE_BOOT and GRUB_DRIVE_BOOT_GRUB variables.
* util/update-grub.in: Fix a few assumptions about the devices holding
/, /boot and /boot/grub being the same.
* util/grub.d/00_header.in: Likewise.
* util/grub.d/10_hurd.in: Likewise.
* util/grub.d/10_linux.in: Likewise.
* util/grub.d/10_linux.in: Implement Linux image sorting with arbitrary
patterns. Use that to define the `.old' suffix as older than `'.
* util/grub.d/00_header.in: Set default gfxmode to `800x600x16'.
* util/update-grub.in: Add a reference to ${sysconfdir}/default/grub in
the grub.cfg header message.
