valgrind support
guard rtc syscall
native fix cpu_switch_context_exit
fix native ctxt switches

fix disableIRQ (remove context switch)
fix enableIRQ (make context switch delay-safe)
change interrupts-off signal-catch behaviour from error to warning
add context switch memory location warning
add syscall guard functions, wrap read/write
guard dlsym calls, wrap printf

gnu libc printf does not use write..
fix include induced warnings
move printf to uart
fix dlsym warning
initial ccn-lite relay import
moved ccn-lite to ccn_lite
fix Makefiles
exclude relay main function
ccn-lite over riot_msg works
use calloc
added riotdev and transdev
backport upstream changes
change to new ipc
fix compiler warnings
remove more includes, fix some warnings