PowerPC people please test the new build code

[Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de>]

Hi,

I checked in a branch with my proposed new naming scheme. The branch
name is mrvn.

Someone please check it out and type "cd build; make". You can adjust
the host used to rsync udeb from in the Makefile, currently its
ftp.debian.org.

TODO:
- extract mirror from /etc/apt/sources.list
- support adding DEBS to the cdrom images
- support floppy/net/foreign (only BOOT=cdrom NEXTMEDUM=cdrom
  DEBS=none suported now)

If you test its important to know if the image boots and contains the
right files. The installation probably won't work due to current sid
screwups. If you get it to fetch installer modules that shows the CD
is fine.

MfG
        Goswin