Added argument 'border' to areaplot() as an explicit argument.
Added error message to areaplot() and confplot() if x-axis values are duplicated.
Improved areaplot() so it supports 'x' to be out of order.
Improved areaplot() so it supports 'x' of class POSIXt and Date.
Improved confplot() so it supports 'x' to be out of order.
Improved confplot() so it supports 'x' of class POSIXt and Date.
Added argument 'rev' to areaplot() to plot the stacked areas from bottom to top. The new default is to plot from top to bottom.
Added confplot() support for 'y1' and 'y2' of length 1 to draw unusual polygons.
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