deb-build: dummy package fixes. Also add rootfs-packages/james-mods:
my own modification which is too big to go into rootfs-skeleton/pinstall.sh.
It contains fatdog's version of xorgwizard, a barebone xwin that works
(basically call jwm_menu_create and xinit), and
default script for udhcpc so that it works. Oh, and qemu-netup script.
rename qemu-netup to eth0-dhcp
deb-build: include apt database
attempt to get apt-get works out of box
deb-build: implement %reinstall.
pkglist: force reinstall perl-core and xserver-xorg-core.
apt-get now works out of box (can do apt-get install).