FW-229.remove functions in scheudle and add them to 6top.
Merge branch 'develop_FW-229' of https://github.com/openwsn-berkeley/openwsn-fw into develop_FW-229

Conflicts:
	firmware/openos/openwsn/02b-MAChigh/schedule.c
	firmware/openos/openwsn/02b-MAChigh/sixtop.c