add missing stdlib.h include
removed unnecessary stdlib.h include
fix table header indentation
Merge pull request #355 from mehlis/stdlib-fix

fix includes of stdlib
Merge pull request #369 from LudwigOrtmann/ps_fix_indent

fix table header indentation
reset context before makecontext call, check

check return value of swapcontext
replace 1 with EXIT_FAILURE in all err calls
add in_isr sighndl safeguard
mitigate against signals when signals are off
mask all signals in signal handler
Merge remote-tracking branch 'ludwig/native_fixup' into safest_demo