1) Use /tmp/qubes-installer-workdir instead of the ugly /Devel/Qubes
2) Use local fedora repo instead of the remote one
3) Still keep the remote fedora repo for extra packages (with higher cost though)
4) Use local repo keys!!!
5) Use nice update_repo.sh script
All in all now use 5 repos during installation:
* build/yum/installer (installer-related rpms)
* build/yum/qubes-dom0 (all the Qubes stuff)
* build/yum/dom0-updates (for select 3rd party packages, e.g. Xorg)
* build/fedora13-repo (local fedora 13 repo, copy from DVD, we don't
keep it uder build/yum, because we don't want our update script
to process it every time)
* remote fedora repo for extra packages (usually deps for qubes-dom0)
