Smoother bandwidth limiting

[Max Kipness]

> I rather like bwlimit... i suffer the same problem as Mikko 
> in that I have a slow uplink.  I haven't experienced his 
> particular problem, though, and bwlimit seems to do its job well...
> 
> Using some other networking tool or QOS just complicates the 
> matter, and since rsync excels at doing large transfers over 
> slow connections, bwlimit seems within the scope of rsync...
> 
> So it's not perfect, nothing is...  RSYNC would loose a lot 
> of appeal if bwlimit got axed, at least for me...

I had some of these issues initially when using --bwlimit. I since
switched to true traffic shaping with CBQ. It works flawlessly as that
is it's job.

Max