plotgroups.barplot: Plot several groups of repeated observations as a barplot.
In ilia-kats/imisc: miscellaneous functions

This is intended to be called from plotgroups.

1	plotgroups.barplot

list of functions plot, ylim, features plot accepts the following parameters:

data: list, each element is a vector of replicates for one combination of parameters
at: numeric vector giving the X locations where the plots should be drawn
stats: list containing the summary statistics (see plotgroups)
colors: colors for plotting
features: the features to plot. At the moment, either mean or median can be plotted. Also, only one of box, iqr, sd, sem, ci can be plotted at the moment.
barwidth: width of the individual bars/boxes etc. as fraction of 1
whiskerswidth: width of the whiskers as fraction of 1
whiskerslwd: line width of the whiskers
whiskerscol: color of the whiskers
bordercol: color of the border
...: additional parameters passed to rect