Like codemapd3.py, but with an ascii renderer.
This is basically just codemapd3.py and treemap.py smooshed together.
It's not the cleanest, but it gets the job done. codemap.py is not
the most critical of scripts.
Unfortunately callgraph and stack/ctx info are difficult (impossible?)
to render usefully in ascii, but we can at least do the script calling,
parsing, namespacing, etc, necessary to create the code cost tilemap.
