Bug#707604: debian-installer: Should warn if disk with GPT doesn't contain bios-grub partition

[Christoph Reiter <reiter.christoph@gmail.com>]

Package: debian-installer
Version: 20130430
Severity: normal

 - Install Debian on a new 3TB disk
 - GPT partition table gets used
 - Do manual partitioning
 - Installation finished (grub install does not produce an error)

Expected:
 - Debian boots

Instead:
 - Grub not found since there was no bios-grub partition

Possible solution:
 - Warn if the disk doesn't contain a bios-grub partition.
 - Explain what is needed and what happens if this partition is missing.



-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (901, 'unstable'), (900, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.8-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

-- no debconf information