Refactored the time series and plots javascript files so that they are

no longer in the subdirectory full_report nor in the namespace
nar.full_report. They each have there own directories and namespaces
(nar.timeSeries and nar.plots). I moved WaterYearUtils.js to common as
that seemed appropriate.
JsHint picked it up  and flagged as a warning. That's how I found it.