Adds the title and generates a new main viewport below the title
prGridPlotTitle(title, base_cex, cex_mult = 1.2, fontface = "bold",
space_below = NULL)
The title as accepted by textGrob
The base cex used for the plot
The multiplier of the base - i.e. the increase of the text size for the title as compared to the general
The type of fontface
The space below, defaults to 1/5 of the title height
NULL
The function does not return a value