GraphViz is an ingenious package created by IBM to visualise lots of possible
object topologies. The package makes it very easy to create all kinds of
directed and undirected graphs from raw data.

Peter 'grin' Gervai shared some simple code to create a very basic network
topology graph from RackTables database. All updates (expecially fine-tuning
the .dot file) are much welcome, since there are hundreds of possible tweaks in
dot (the submodule he is using here) itself.

Peter 'grin' Gervai use dot (which is the most general topology module) becaus
his tests showed that default layouts of other modules resulted inferior outputs.
Still, the .dot file is the same, and you're all free to tweak other settings
and show us all. :-)

If you use accented characters for strings you have to recode the output to UTF-8
somehow. This can be done using konwert or recode or other tools.

Please adapt the configuration in /etc/RackTables/DatabaseLoginData.pm to your
personal needs before you start.