Ability to checkpoint and the restore a myplc configuration. This will checkpoint...

Ability to checkpoint and the restore a myplc configuration.  This will checkpoint the db state (both plc and drupal) as well as grab a copy of /etc/planetlab.  The resulting checkpoint file is then given tot he restore functionality, which updates the plc&drupal dbs with the data and copies over the checkpointed content of /etc/planetlab.  This *should* be enough to bring the state of an stopped plc over to another instance of plc.