probably a breaking change to move up to new abstracted tunneling script.

probably a breaking change to move up to new abstracted tunneling script.
the screened tunneler makes an ssh tunnel solely based on the command line parameters,
which sounds obvious but is actually a big improvement.  start tunnels is now called
tunnel zooty, at the moment anyway, and that's the user of the screened tunneler.
if this works nicely, other tunnel scripts can also be converted.