[RkWard-devel] colored lines/points

[SJR]

I did a little change in the plot_options plug-in which allows now to give a 
certain color to the line of a plot (via <dropdown> -list). I tested it with 
the Normal distribution plot and it seems to work as expected (anyway, did I 
mention that preview rocks?). Right now more than 73 colors or so are 
available (mostly the standard colors plus some funny like tomato, 
thistle ... and of of-course the color which describes RKWard "royalblue"). 
If you have a desire for a certain one let me know or change it yourself.

However, keep in mind this is just a quick and dirty solution for the 
meanwhile till Thomas or somebody else will make a real color selection so 
that any of the available colors (more than 600 ;) ) is selectable.
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