Use this class to determine which dot plot creation utilities need to be added to iSEE. Obvious candidates are utilities to set font size or to add the coord_cartesian layer.
.addFacets should probably operate more like .addMultiSelectionPlotCommands in terms of taking a commands= and slapping a + to the end to modify the ggplot construction.
Cross-reference to https://github.com/iSEE/iSEEu/issues/57