doc: Mention safe_qx in the tutorial

Signed-off-by: Niels Thykier <niels@thykier.net>
r/html_reports: Avoid forking (yet another) shell

Signed-off-by: Niels Thykier <niels@thykier.net>
helpers: Avoid forking a shell when examing the binaries

Signed-off-by: Niels Thykier <niels@thykier.net>