code improvements
Merge remote-tracking branch 'origin/master2'

Conflicts:
	pass_flow/contiki-sky.a
	pass_flow/contiki-sky.map
	pass_flow_clock/contiki-sky.a
	pass_flow_clock/contiki-sky.map
	pass_flow_clock/pass_flow_clock.c
	pass_flow_clock/pass_flow_clock.sky