Disable the usage of ptrace() by all processes

[raja-grewal]

This pull request upgrades existing sysctl to now disable ptrace() usage by all processes.

Previously it was restricted to users with CAP_SYS_PTRACE and this upgrade is not expected to cause any more software breakages than the previous setting.

See #321 for further details.

Note this is essentially a resubmission of #242.

Changes

kernel.yama.ptrace_scope=2
to
kernel.yama.ptrace_scope=3

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[ArrayBolt3]

Merged into my arraybolt3/trixie branch with some minor typo fixes.