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.
specific files (yaboot.conf and boot.msg) to the release subdir and changed
boot scripts for potato and woody to adjust to this.
Added sarge script for booting powerpcs (still lacks some subarches).