Thu Dec 4 17:17:47 EST 2014

Snarfing params

- Create a special form that names each parameter

- Keep parsing at high rate until the structure changes.  If it
  doesn't change, send only parameter values.

- Listen for parameters on stdin.

So got a macro form to gather parameters, but it's not integrating
well into ai-lambda / ai-app.  Probably doing something unorthodox
here that should be solved somewhere else.  There is already an
explicit treewalker, right?

Solved by adding to stream-lib.rkt which has correct bindings.

- defaults / initial values.
- param updates?

EDIT: Done initial values.