patch to fix disk usage numbers on FreeBSD

[Doug Porter]

> -P and -k are mutually exclusive:
[snip]
> So the correct patch should remove one or the other.

They're not really mutually exclusive, and both are required for
a portable solution.  If one option is removed you'd have to
remove -k and change MogileFS to adjust.  The -P is absolutely
essentially, because that is what asks for a predictable output
format.

Here is a quote from SUSv3 that describes -k and -P being
combined:

    STDOUT

	When both the -k and -P options are specified, the
        following header line shall be written (in the POSIX locale):

        "Filesystem 1024-blocks Used Available Capacity Mounted on\n"


It is also worth noting that FreeBSD df was recently modified to
better adhere to the specification.  The commit message can be
seen here:

<http://www.freebsd.org/cgi/cvsweb.cgi/src/bin/df/df.c?rev=1.66&content-type=text/x-cvsweb-markup>


The fact that the output for -k alone in FreeBSD is approximately
the POSIX format is irrelevant.  Following the spec will make
MogileFS more generally portable.

-- 
Doug Porter <dsp at dsp.name>