Sort package listings by nsort from Sort::Naturally.
Cleanup config file, drop most ignores since we have overrides.
Fix syntax error.
Prefer systemd services to rc.d services.
Update version number.
Detect binaries run from user sessions.
Add user notification.
Don't spawn a subshell.
Make user session notification working and supply sample scripts for tty and X11 sessions.
Drop write's warning about UID/EUID mismatch.
Fix warning about unchecked prototype (recursive calling).