Added ability to use "@" symbol in command named in the inittab file. This
treats commands as literal and does not launch a shell to interpret them.
Updated inittab manual page to include overview of symbols which trigger
a shell interpretor and how to disable them using the @ symbol.
Closes Debian bugs #815839, #905245 and #890478
Added -f <format> option to pidof program to allow printf
style formating.
Closes Debian bug #571590
Thanks to Philipp Marek for the patch.