fovPlot,RccSet-method: Fields of view (FOV) plot
Description
Plot the fraction of successfully imaged fields of view (FOV) in the given RccSet.
The RccSet's phenoData should have 'FovCount' and 'FovCounted' columns populated with the total
and successfully imaged FOV counts, respectively. Samples with a FOV counted/FOV count of less than
80