Bug#249786: Minimum size for / is 48MB on i386

[Christian Perrier <bubulle@debian.org>]

tags 249786 pending
thanks

I ran a complete install of a base system (package selection==none)
from the sarge_d-i daily buil of 20040519.

I used a manually crafted partitioning scheme with a 100MB /, 500MB
/usr, 100MB /var

After installing, 48MB was used in /, 78MB in /usr and 18MB in /var

So, I guess that the minimum size for the root partition should be
about 70MB (even this will be a bit short and make multi-kernel
installation a bit tricky).

I adapted the multi_user recipes for all arches, though I'm pretty
sure the binary sizes may slightly differ.