Changing parameters in TinyOS via Makefile

Changing the Radio channel
- Radio channel numbers have range between 11 to 26
- Add the following line in the Makefile before the Makerules
CC2420_CHANNEL=x where x = [11 26]
Changing the Radio Transmit power
- Transmit power valid levels are 1 to 31 with power 1 equals to -25dBm and 31 equals to max (0dBm)
- add the following line in the Makefile before the Makerules
CFlags = -DCC2420_DEF_RFPower= x where x = [1 31]

Changing the Active message group ID
Add DEFAULT_LOCAL_GROUP = X to the makefile where X = [0×10 0×50]

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