HEADS UP: iso images now with more binaries

[Martin Husemann <martin%duskware.de@localhost>]

Just a quick note: after some discussion on tech-install I have just switched
over the i386, amd64, sparc64 and vax CD images to a new, much simpler
sheme based on sets instead of single files or pax patterns.

This means: the install CD images have grown slightly and will contain
all binaries needed for a running system. What is left out from the
base set is mostly compat (i.e. 32bit libs on amd64 and sparc64) and
rump stuff (not to bash on rump, but it used quite some space and was
of limited usefullness for install purposes).

I may have introduced bugs in the switch - if so, please let me know
(preferably via send-pr).

Thanks,

Martin