Thanks to:

Roger Dunce <kronos@nanunanu.org>
	Alpha testing and patches for my blind spots with divison by zero ;)

Joern Clausen <jc@genetik.uni-bielefeld.de>
	Several ideas for collapsing paths and web-depth options.

Jason Allen <jason@cnpapers.com>
	Minor fix for IE rendering of bar graphs.

Paul M. Lambert <plambert@nas.nasa.gov>
	Patches for rounding and web page headings.