[plt-scheme] Highlighting parentheses.

[Anton van Straaten]

> Well, I guess this is just par for the course, I suppose. I add a
> feature discussed here and 5 people ask for something more 

No fair, you added the feature so quickly that not all of the peanut 
gallery had had a chance to chime in!

BTW, you should know that from now on, you will be held to this 
incredible turnaround time on all feature requests, regardless of 
complexity.  Think of it as our way of thanking you for the great work 
you do!

Anton