[Tinyos Core WG] Interface switchover: Packet, Send, AMSend, Receive

[Philip Levis]

I've just checked in the changes to the Packet, Send, AMSend, and  
Receive interfaces following the discussion on TEP 116. A summary of  
the changes:

Packet: "void* getPayload(message_t*, uint8_t*)" has become "void*  
getPayload(message_t*, uint8_t)"
Send: "void* getPayload(message_t*)" has become "void* getPayload 
(message_t*, uint8_t)"
Receive: removed getPayload and payloadLength
AMSend: "void* getPayload(message_t*)" has become "void* getPayload 
(message_t*, uint8_t)"

I've also updated the TEP. I tried to scour the repository as best I  
could for places where they are used/provided, but I might have  
missed a few. I updated the CC1000, CC2420, TDA5250, XE1205, and  
serial stacks. I tested a few complex apps, and everything seemed to  
work fine. If you find issues or things I missed, please let me know.

Phil