fix debug output
fix some defines in tcb.h
catch some null pointers in RPL
provide a default next hop (preferred parent)
add toa to packets in nativenet

also change order of fields to reflect radio types header
add -Wextra -pedantic to native CFLAGS

it's all about code quality
remove all vtimers before (re)scheduliing it
Merge pull request #345 from LudwigOrtmann/native_cflags_ng

add -Wextra -pedantic to native CFLAGS
Merge pull request #373 from OlegHahm/trickle_dao_fix

Trickle: remove vtimers before (re)scheduling it
Merge pull request #371 from OlegHahm/rpl_null_pointer

RPL null pointer handling
Merge pull request #362 from LudwigOrtmann/nativenet_toa

add toa to packets in nativenet
Merge pull request #368 from mehlis/findings

(non critical) findings