multiPlotDataOverview: Produces a 4 panel plot that gives an overview of the data set prior to any processing
Description
The four plots produced are 1) log concentration versus log discharge, 2) log concentration versus time
3) a boxplot of log concentration by month, and
4) a side-by-side boxplot of the sampled discharges and all daily discharges.
To save space, the graphic is labeled only at the top of the 4 graph display.
Although there are a lot of optional arguments to this function, most are set to a logical default.