Added function agesFbar() to calculate a suitable age range for Fbar.
Added example data frame gss to demonstrate the calculation of an age range for Fbar.
Improved mohn() to support 'main', 'xlab', and 'ylab'. Code contributed by Ruben Verkempynck and Raphael Girardin.
Added ICES (2020) reference to mohn() help page.
Added argument 'len' to DLS3.2(), deprecating 'i1' and 'i2'.
Added arguments 'percent', 'sign', and 'na' to icesRound().
Added function mohn() to calculate Mohn's rho.
Added example data frame icod to demonstrate the calculation of Mohn's rho.
Added function icesRound().
Renamed argument 'prebuffer' to 'buffer' in DLS3.2().