This is a preliminary version of pstat and is based on the file tree walk 
code -  mpi_ftw.  It also serves as an example of how mpi_ftw can be modified
to fit specific needs.  This software was developed for purging purposes 
but it also reports statistics similar to fsstats.  It is currently being 
tested and should NOT be used for purging or statistics gathering at this time.
Usage information follows:

usage:  mpirun -np 8 ./pstat -e 2w -p /top_level_dir_to_walk 
                     -u /usage_file_output_path_and_filename
                     -s /csv_fsstats_output_file_path_and_filename


example: mpirun -np 8 -N 4 ./pstat -e 2w -p /home/at
                                  -u /home/at/usage -s /home/at/stats.csv

NOTE:  This is a preliminary version meant for demonstration purposes only. Do not
use the purging option (-f).  Statistics information is still being verified at 
this time.

ARGUMENTS:

-f will turn on file deletion *warning*
verbose is really for debugging, not meant for users...

-p --path
	starting point for the treewalk to begin

-v --verbose
	turn on verbose output.  this slows it down a lot.  used for debugging

-d --db
	use database API.  depending on which db is implemented in db.c, this 
	will have different behavior.  right now each process writes csv files
	that are intended for easy import into a db post-run.

-f --deletefiles
	this will delete any file that exceeds the specified expiration time

-s --stats
	this is a port of fsstats.  see http://www.pdsi-scidac.org/fsstats/
	for more information.  there are slight differences in the parallel
	port such as not able to track repeated hardlinks.

-u --usage
	turn on usage statistics.  this is in the format that 'checkscratch'
	can parse.  on bproc node, there is no way to auto convert to moniker
	from uid, so post processing will be necessary.  the usage is how
	much file space each user is consuming.

-e --expire
	this is required to run right now.  this will tell us how old an 
	expired file is in relation to now.  the argument to this is a
	combination of a number and a letter. examples and acceptable 
	letters below:
		d : day
		w : week
		m : month
		y : year

		example: 2 days - 2d
			 4 weeks - 4w
			 10 months - 10m
			 500 years - 500y

-h --help
	print out usage