cbuf implementation

Hi there,

I just had another look at our cbuf implementation, and on how it is 
used:
it seems that everyone (excluding the ports subsystem) has taken cbuf 
to be more or less a circular buffer. But it is not - it was used 
completely wrong everywhere, and is used very inefficient by the ports 
implementation. That's BTW why the keyboard and mouse drivers don't 
work as expected - it's less obvious in the keyboard driver, as it 
overwrites the same byte over and over again (instead of buffering the 
input), but the mouse driver only writes to byte 1 and reads out 3 
bytes as a packet - go figure.

IOW we don't need our cbuf implementation - we need something that we 
are already using but don't have :)
In case anyone steps up now, you have the job, if not, I'll be doing 
it. Unless I hear something else in the mean time, I start doing it in 
around 5 hours.

Bye,
   Axel.



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