* Parser: Added new tb command to set the name of the sync server:

	tb-set-sync-server <node>

  This initializes the sync_server slot of the experiment entry to the
  *vname* of the node that should run the sync server for that
  experiment. In other words, the sync server is per-experiment, runs
  on a node in the experiment, and the user gets to chose which node
  it runs on.

* tmcd and client side setup. Added new syncserver command which
  returns the name of the syncserver and whether the requesting node
  is the lucky one to run the daemon:

    SYNCSERVER SERVER='nodeG.syncserver.testbed.emulab.net' ISSERVER=1

  The name of the syncserver is written to /var/emulab/boot/syncserver
  on the nodes so that clients can easily figure out where the server
  is.

  Aside: The ready bits are now ignored (no DB accesses are made) for
  virtual nodes; they are forced to use the new sync server.

* New os/syncd directory containing the daemon and the client. The
  dae...