Changed powerpc kernel selection method in generate_di+k_list.
Updated boot-$ARCH for the arches using d-i so that it is easier to
change the repository for d-i and removed -q option of wget to see
wget failures in the logs.
has now multiarch support.
Added generate_di+k_list script to generate debian-installer+kernel task
trying to put on it the best kernel for each architecture.
Upgraded post-boot-alpha for sarge (use d-i instead of disks-alpha).