This module lets you create graphs (nodes/vertices connected by
edges/arcs, not pie charts!) and then lay them out on a flat surface.

Once laid out, the graph can be converted into various output formats
like ASCII art, HTML or SVG. You can also output the graph in graphviz
format and let dot/neato/circo etc. do the layout for you.

Graphs can be either generated by Perl code, parsed from a simple
text format that is human readable and maintainable, or parsed from
Graphviz code.
