RIOT-OS/RIOT — pull request #1528 by OlegHahm (2014-08-01 15:42:20+00:00)
Title: rpl: mute RPL

Removes all but one occurrence of printf and puts within routing (the
remaining puts is called from a debug function.

Possible solution for #641.

I'm not sure if muting all error messages is so smart. Maybe we shoud add a `WARN` and/or `ERR` macro for `DEVELHELP`?