[plt-scheme] High precision timing and MrEd/OSX

> In any case, it occurs to me that your signal handler could just call
> scheme_signal_received() to solve the main problem. 

This works!  Fantastic, thanks.

I will look into your other suggestions in the next weeks, it would be
nice to implement this all in scheme, with further bonus that then it
would work under Windows.  If I can get it working I will do some
measurements and let you know how it compares.

Thanks again,
Regards,
Rohan