PID file handling.

[Yotam Rubin]

Hey,

	argus currently generates PID files based on the number of running
argus instances, and the interface being audited. I've written a patch
that allows users to enable the generation of PID files via the command line,
something that's currently only available using the configuration file. 
The patch currently supports two schemes of PID file generation:
The original scheme, where argus chooses the name of the PID file itself
and the new method, where the user may specify the name of the PID file.
Anyway, I was wondering whether the original method should be preserved. It
leaves little room for flexibility, and the user may not always trivially know
the location of the PID file. I believe most programs that generate PID files
require the user to its location, and/or have a constant default. Also, the
manual page was a bit unclear about how PID files are generated, this was
addressed in my patch as well.

	Best Regards, Yotam Rubin
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