NAWQAAN-205

* Added TN data to hydrograph
* Just a bit more cleanup as there is still too much hard-coded.
I'd do something like
```
getDataById = function(id, field, default) {
    var result;
    var components = nar.fullReport.TimeSeriesVisualization.getComponentsOfId(id);
    var vizType = nar.fullReport.TimeSeriesVisualization.types[components.category];
    if (vizType) {
        result = vizType[field];
    } else {
        result = default;
    }
    return result;
};
```