sys/ps: make use of thread_get_status()
sys/ps: make use of thread_get_status()

authmillenon/RIOT,ant9000/RIOT,miri64/RIOT,authmillenon/RIOT,ant9000/RIOT,OlegHahm/RIOT,kYc0o/RIOT,OTAkeys/RIOT,jasonatran/RIOT,kYc0o/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,authmillenon/RIOT,kaspar030/RIOT,OTAkeys/RIOT,kaspar030/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,ant9000/RIOT,miri64/RIOT,jasonatran/RIOT,OlegHahm/RIOT,miri64/RIOT,jasonatran/RIOT,ant9000/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,OTAkeys/RIOT,miri64/RIOT,kYc0o/RIOT,jasonatran/RIOT,miri64/RIOT,authmillenon/RIOT,ant9000/RIOT,kYc0o/RIOT,kYc0o/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,kaspar030/RIOT,OlegHahm/RIOT