Bug#673156: wheezy netinst and businesscard images not bootable

["Brian Boonstra" <debian-user@boonstra.org>]

Package: grub-installer
Version: 1.70

I have found the cd images for netinst and businesscard to be unbootable,
both in a VirtualBox 4.1.14 VM and when burned to CD and placed in a
physical system.  I verified that both systems work fine with the
analogous .iso files from stable.

This involves every .iso downloaded from

http://cdimage.debian.org/cdimage/daily-builds/daily.new/current/i386/iso-cd/

but does NOT affect the alpha installer version, e.g. at

http://cdimage.debian.org/cdimage/wheezy_di_alpha1/i386/iso-cd/debian-wheezy-DI-a1-i386-businesscard.iso