DiskUsage docs: update screenshots.

- Why were we using old BeOS screenshots here?
- Why is this not part of the user guide anyways?

Revert "Delete old DiskUsage docs."

Apparently, upon reading the "fine print" at the bottom, these docs *must*
be distributed with the binaries.

Now to try to contact the author...

Imported the nice disk usage tool "Guido" into the repo as "DiskUsage". Guido
was originally written by Mike Steed. The code was freely available from his
website at one point, which I am no longer a

Imported the nice disk usage tool "Guido" into the repo as "DiskUsage". Guido
was originally written by Mike Steed. The code was freely available from his
website at one point, which I am no longer able to find. I believe the license
was a kind of public domain, at least compatible with our MIT/X11 license.

The original code was well written with it's own coding style which was not
very far from the Haiku coding style. I have hopefully adopted it completely
to our coding style. While I did this, I came across several places with
comments for a minor bug which I was able to resolve all. I also found ways
to simplify certain places and I elliminated all non-necessary "inter-class
knowledge" which was used to directly access members of other classes which
should have been private.

All in all, this should be a nice little addition, a useful tool which I found
handy a lot of times. If I should not have added this without first consulting
everyone, please voice your disagreement, and it can be removed it again. It
is not part of the image yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27357 a95241bf-73f2-0310-859d-f6bbb57e9c96

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