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.