Truncating udev persistent net rules in remove-udev-persistent-rules.chroot hook rather than to remove them (Closes: #680763).

This allows to have non-persistent net devices with persistence properly,
see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=680763#10 for more information.

Sleeping for 1 second before after accessing the loop device in order to not fail when removing it right afterwards.

Using 'live' rather than 'incomplete' for cd_type in .disk on images that include debian-installer with live-installer udeb.

Adding mdadm manually to extra packages for binary pool for being used by debian-installer (Closes: #607225).

Fixing corruption of usb binary images caused by trying to modify flags in partition table when image is mounted with offset.

Setting partition flags after creating the filesystem, workaround for bug in parted where we result in having the partition type set to linux otherways, thanks to Cody A.W. Somerville <cody.somerville@canonical.com> for the idea.

Correcting variables names for standard and rescue package lists and tasks automagics for default flavours.

Adding support for Ubuntu jaunty and natty, thanks to Cody A.W. Somerville <cody.somerville@canonical.com>.