Takes a colour defined in hex format as
#XXXXXX and adds a two transparency bytes
XX based on a number from 0 to 1. Its main use is to make RColorBrewer palettes transparent.
A list of strings defining solid colors in six byte format.
A value (or list of values) from 0 to 1 specifying transparency.
A list of strings defining transparent colours in eight byte format.
# Make a list of semi-transparent RColorBrewer colours, based on Brewer's Red palette with 5 shades add.alpha(brewer.pal(5,'Reds'),0.5)
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