reverted files to use function for slider format because that's the version that works with this slider.js
First Pyramid Chart

* pyramidchart.js builds charts out of two bar charts and positions them in the container with a single ordinal y scale up the middle: note, redraw is not yet working on this chart, and it needs to.  Also seems to be some trouble with axis label positioning logic
* NeffBarAnim and barGraphTests use the new code
* build.sh includes code and compiles