HBSD: paxify ptrace hardening - part 2

github-issue: #60 #62
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
HBSD: allow to specify wheel group, as allowed group

github-issue: #60 #62
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
CC: Shawn Webb <shawn.webb@hardenedbsd.org>