v1.0 - plot updates

#<col> a colour for the ploting (default="black"). Is ignored if
plot=FALSE.
#<lines> whether to plot the results as lines instead than as boxplots
(default=FALSE). Is ignored if plot=FALSE.
#<add> whether to add to the current plot (default=FALSE). Is ignored
if plot=FALSE.
#<shift> a numerical value between 0 and 0.6 for shifting the lines. Is
ignored if plot=FALSE, lines=FALSE, add=FALSE.