Explore anti-aliasing settings of different plotting devices

[nuest]

As the blow image show, the text in these base R plots seems to have some kind of anti-aliasing effect. Note that bars match perfectly:

Therefore we must explore what settings for plots are favourable and which settings are obstructive for comparison within the checker.

Tasks

• create a small (!) set of plots with both base R and gglot (use the respective documentation for examples)
• evaluate resources (see below for a start) for potential settings changing rendering options, including the underlying devices
• consider how Cairo might affect this

Resources

• https://stat.ethz.ch/R-manual/R-devel/library/grDevices/html/png.html
• https://www.r-bloggers.com/exporting-nice-plots-in-r/
• http://gforge.se/2014/01/fast-track-publishing-using-knitr-part-iii/
• http://gforge.se/2013/02/exporting-nice-plots-in-r/#Lines_and_text_anti-aliased_-_not_fillspolygons