the prototype is now complete, for all practical purposes.  The admin site is a simple editable table with deletable rows and a button for adding rows.  No bigtable functionality is included, so it only looks like it is doing something.  The next time the admin page is loaded, we are back to the default starting values.  I also added some hovering flags to the charts, to convey values and units.  It looks pretty flashy.  Maybe I added the pdf in the previous commit, but anyway there is also a dummy pdf that opens when it should in the exemption request dialog.