Another big reshuffle of this module, hopefully to make things more readable:

- re-installed some comments that Jeremy obfuscated
- renamed the crazily named "redirectCaptureThread" to a name that matches what it does
- highlight the likely cause of #443005: 

The magic named event is no longer found even though Zope is still running.
I suspect this is because runzope is now a setuptools .exe.