HardenedBSD again

Hi folks,

While Shawn and Oliver are working hard to make automatic builds fully workable (as mentioned here), I have just finished my long week end of coding to improve the ptrace branch. Now all request flags (for example hardening.ptrace.flag.trace_me) can de enabled/disabled atomically (or all at once via sysctl hardening.ptrace.flag_all) at will. Everything is on the unstable branch.

For now I m going to help them to fix some issues and will surely come back on it for adding more features.

More things are coming but will be known in due time ;-)