rtnet define added, work now with realtime Ethernet protocol -cleaner
elmo pdo mapping - readmap without complete access
replace Linux timer with realtime timer - avoid mode switch in Xenomai
add elmo emergency code dictionary
add log comments to README
Merge branch 'master' of https://github.com/huy-cong/soem-rosbuild

Conflicts:
	src/oshw/linux/nicdrv.c
	src/oshw/linux/nicdrv.h