"tb-set-tarfiles" is like "tb-set-node-tarfiles" except that it
distributes the tarfile to all nodes rather than just one and that it
uses frisbee to distribute the file.

These changes involved 1) refactoring frisbee info from images table
into a new table, frisbee_blobs, 2) a new experiment_blobs table, and
3) a new tmcd command so the node knows how to get the files from the
server.

The changes where designed to be general purpose enough to eventually
support:
  1) Distributing arbitrary files (not just tarfiles) to nodes
  2) Perform arbitrary actions on those files
  3) Use arbitrary methods to get the files

As such the tmcd line is as follows:
  URL=* ACTION=*

where URL is currently:
  frisbee.mcast://<ADDR>/<FILE>
for example
  frisbee.mcast://234.16.184.192:18092/users/kevina/home-dir.tar.gz
and when we get around to using a master Frisbee server it could be
  frisbee://*
or it could be a file://, http://, etc.

and ACTION is currently:
  unpack:<LOCATION>
for example
  unpackt:/users
with future syntax to be determined.