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
Updated the CC2538 startup file to support the backdoor bootloader (BSL).
Merge pull request #96 from peretuset/develop

Updated the CC2538 startup file to support the backdoor bootloader (BSL)
SAMR21 BSP Support Added
Build Failures are Fixed for SAMR21.
FW-271. (dummy) 01bsp_aila application.
Fixed FW-258. The UART peripheral of the CC2538 has a shadow register that needs to be emptied by a timeout interrupt, otherwise the last byte does not get processed until a new byte arrives. This affects the communication with OpenVisualizer since it relies on communicating full HDLC frames.
Removed the initialization delay of the UART peripheral since it is no longer required.
Merge pull request #98 from OpenMote/develop

FW-258. Fix.
aila -> mercator (WIP)
FW-271. aila -> mercator (WIP).
FW-271. aila -> mercator.
FW-271. aila -> mercator.
FW-271. 01bsp_mercator -> 03oos_mercator (WIP)