Changing the color of bars in single series Vertical & Horizontal bar charts

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Add a color set in the same way that the example is given for a pie chart to 
a bar chart
2. Change the variable '$chart->getPlot()->getPalette()->setPieColor' to 
'$chart->getPlot()->getPalette()->barColorSet' after looking in color class 
source code.
3. Colors provided are ignored. Apache log tells me 'Missing argument 2 for 
ColorSet::ColorSet(),'

What is the expected output? What do you see instead?
I would like to have a different color bar for each point in my chart, as my 
chart only has one series.

What version of the product are you using? On what operating system?
1.3, Ubuntu LTS

Please provide any additional information below.
If possible, can we add code that counts the series, and if there is only one 
series, can we make it default to a different color per point?

Original issue reported on code.google.com by [email protected] on 16 Oct 2012 at 4:31