Add JSLint header.
Remove unused code.
Remove excess whitespace.
Remove extra call to setupUI().
Start work on abstract base chart class for non-stacked charts.
Add utility to encode URL query terms.
Add utility to extract a Date from a Datum.
Support custom URL parameters on sn.datum.loader.
Start work on seasonal DOW chart using general node datum API. Not quite complete.
Support vertical rules in base chart; support using an ordinal scale for X axis.
Add standard color set for "seasons".
Fix CSS style for vert rules.
Update to general node datum API.
Remove unused pane.