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.
Hah, this didn't have a var previously huh. I wonder if jslint/jshint "use strict"; would have caught that