renamed SUCCESS constant in sixlowerror
Merge pull request #220 from OlegHahm/sixlowerror_relabeling

renamed SUCCESS constant in sixlowerror
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
add daemonization function to startup.c
add rudimentary log support
fix log creation permissions
add stderr log
pre-init stdout