[Tinyos-2.0wg] AMPacket

[Philip Levis]

Following the discussion two weeks ago and the agreement that  
AMPacket should have a source accessor, I've updated the Serial,  
CC1000, and CC2420 implementations to provide such. Serial raises a  
few interesting issues, as currently the BaseStation acts through  
SerialActiveMessageC. Setting the source is fairly meaningless (you  
know which node it is from the connection point), so in my version  
SerialActiveMessageC does not set the source address.

I am ready to check these changes in, but wanted to give people a  
head's up. This is going to affect *all* AM communication  
abstractions. For example, the TDA5250 will require a source address  
in its packet, as will the xe1205. I just wanted to check that  
everyone is OK with this.

Phil