Create HLS Colors
This function creates colors of class HLS; a subclass of the virtual
color-class class.
HLS(H, L, S, names)
H, L, S | 
 These arguments give the hue, lightness, and saturation of the
colors. The values can be provided in separate   | 
names | 
 A vector of names for the colors (by default the row names of
  | 
This function creates colors in an HLS color space. The hues should lie between between 0 and 360, and the lightness and saturations should lie between 0 and 1.
HLS is a relative color space; it is a transformation of an RGB color
space.  Conversion of HLS colors to any other color space must first
involve a conversion to a specific RGB color space, for example the
standard sRGB color space (IEC standard 61966).
An object of class HLS which inherits from class color.
Ross Ihaka
# A rainbow of full-intensity hues HLS(seq(0, 360, length.out = 13)[-13], 0.5, 1)
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