stream_bw event

[Robert Hogan]

Mentioned this on irc the other night and took the attached approach. 

If you are happy with the general outline, I can prepare a proper patch adding 
stuff to the docs etc and with proper comments. There are probably a couple 
of house-style solecisms in there too, so please let me know.

I've casually tested it but not to destruction: it works for me so far.

R/W events with 0 bytes are not reported to the controller as per Nick's 
suggestion.
-- 

KlamAV - An Anti-Virus Manager for KDE - http://www.klamav.net
TorK   - A Tor Controller For KDE      - http://tork.sf.net
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