committed current version of bidir before merging
Merge branch 'bidir' of https://github.com/crenner/tinyos into debug
- added debug output (printf via serial line), has to be activated with "ORINOCO_DEBUG_PRINTF"
- added a flag/status byte to beacons. At the moment, this indicates whether the receiver's queue still has space (required due to the use of implicit acks).
- received packets are no longer acked, if they are rejected/dropped by the queue
- cleaned up code, removed unnecessary lines and comments
Merge branch 'debug' of https://github.com/crenner/tinyos into debug

Conflicts:
	Orinoco/apps/PeriodicSender/Makefile
	Orinoco/apps/Sink/Makefile