removed comment
by default, radio should go idle after rx or tx
clean-ups
Big overhaul of radio driver.
Now uses Busywait for powercycling.
Fix of the Pending packet problem.
Various small fixes, seems much more stable now and performs much
better.
bugfix: set packet buf addr, not attr
Big overhaul of SimpleRDC:
	* uses Busywait for channel sampling
	* reset timer instead of setting - less/no drifting
	* many small fixes, now seems stable for unicast and broadcast