Increase the ggplot2 dependency to 2.2.0 or later, "panel.margin" is now deprecated and has been superseded by "panel.spacing".
Ensure that horizontal facet labels have sufficient vertical spacing.
Correct the alignment of vertical facet labels.
Add margins to axis tick labels and axis titles.
Increase the default size of axis tick labels and axis titles.
Option "axis.black" is now TRUE by default.
Fix several warnings raised by R CMD check
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Correctly document the "axis.title" option.
Option "axis.title" controls the relative size of axis titles.
Warn if "CairoFonts" is true but the Cairo package is not installed, rather than stopping execution (as was previously the case).
Option "axis.black" draws axes, ticks and labels in black, not grey.
Option "legend.position" controls legend position and justification.
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