[CM] Correct way to "reset" and s7 instance?

[bil at ccrma.Stanford.EDU]

> Can anyone tell me what the right way to reset an S7 instance

In repl.scm, I do all the evaluation in top-level-let which
is initialized to (sublet (rootlet)).  So, to restart with
a clean slate, you evaluate

(set! top-level-let (sublet (rootlet)))

Or that's the claim anyway -- I can't remember that I ever
tried it.