* Download the eventkey with new tmcd call.

* Pass -k option to various agents so that they can verify the HMACs
  in the incoming notifications.

* Change program agent; The list of agents from tmcd now includes the
  command, which is written to a config file for the program-agent to
  read in. The command string in the event is now ignored.

* Build the local proxy for linux, and add the goo to start the local
  elvind and use the proxy. It has been this way on FreeBSD for a
  while, but I never got it installed for Linux before now.