General file writing parameters for plots in RstoxBase

Arguments

Format: Character: The format of the output file from plotting functions, defaulted to "png". Other options are defined by ggsave, including "tiff", "jpeg" and "pdf".
Width: Numeric: The width of the plot in centimeters, defaulted to 17, as per the instructions to authors for submission to the ICES Journal og Marine Science.
Height: Numeric: The height of the plot in centimeters, defaulted to 17.
DotsPerInch: Numeric: The number of dots per inch (DPI), defaulted to 1200.