Named colors

The 148 CSS color names plus transparent, ordered by the hue rgb2hsl reports. Each row is one sixth of the hue circle; names that land on the same hue are ordered light to dark. The last row holds the ones with no hue at all: when saturation is zero the hue is undefined and rgb2hsl returns 0, so sorting those among the reds would put every grey next to firebrick for no reason.