If LB_HDD_SIZE is "auto" the size will be determined automatically as before
else it will be the given size in MB.

Also setting the default for this to "auto"

[A-Z] and [a-z] expands if there is a file or directory with one letter in the
directory.

Dropping dedicated backports mirror handling, not needed anymore with the move of backports.d.o into ftp.d.o.

Adding check for ntfs-3g on the host system, precluding the initial ntfs binary filesystem support (Closes: #697793).

Using dpkg-divert in chroot_upstart script to handle upgrades of upstart during the build (Closes: #702537).

Correcting typo directory when dereferencing syslinux symlinks when building chrooted, thanks to Luigi Capriotti <l.capriotti@xbmc.org>.