[plt-scheme] Exposing non-exported module variable bindings.

Lo, on Wednesday, December 17, Richard C. Cobbe did write:

>   2) Requiring the schemeunit modules causes executions to take
>      dramatically more time; I don't want to pay this penalty unless I'm
>      actually testing the code.

To clarify this: by executions, I mean the process of hitting the
Execute button, not actually running the code.  Check-Syntax takes a lot
longer too, so I'm fairly sure this is due to some complicated macro
definitions in the SchemeUnit code.

Richard