Begin switch to URNs with slice URN.
Other minor things.

Fix some error reporting.

so that it can be used for Xen.

The model changed a bit after Jon did his version
(with the introduction of dynamically created vnodes on shared nodes).

This is still a work in progress.

slice; it happens when the experiment is deleted.

Somewhere around fedora10, our ntp.conf file was causing ntp1.emulab.net
to no longer be able to update the clock on nodes.  Needed to un-restrict
access from that server.

Also, we were not going through our ntpd startup for f10 nodes.

Initial working version with multiple CMs and pretty much everything that was part of the spec for GEC6

Initial working version with multiple CMs and pretty much everything that was part of the spec for GEC6

Initial working version with multiple CMs and pretty much everything that was part of the spec for GEC6

Initial working version with multiple CMs and pretty much everything that was part of the spec for GEC6

Initial working version with multiple CMs and pretty much everything that was part of the spec for GEC6

Initial working version with multiple CMs and pretty much everything that was part of the spec for GEC6

Initial working version with multiple CMs and pretty much everything that was part of the spec for GEC6