enabling ch.hopping
HDLC XBee-compatible defines
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mergint develop into master after rpl integration and scons msp430-gcc toolchain.
Merge branch 'master' of github.com:openwsn-berkeley/openwsn-fw
Merge branch 'develop'

Conflicts:
	firmware/openos/drivers/common/hdlcserial.c
	firmware/openos/drivers/common/openhdlc.h
cleaning after merge
unpacking struct that does not need to be pack