qualpalr 0.4.0

Major changes

• autopal() is a new function that tweaks the amount of color vision
  deficiency adapation to match a target color difference.
• qualpal() argument colorspace now also accepts a matrix or
  data.frame of RGB colors.

Minor changes

• qualpal() sorts palettes in order of increasing color distinctness.
• qualpal() argument colorblind has been made defunct.
• Documentation for qualpal() has been improved.
• Colors are now generated with randtoolbox::torus() instead of
  randtoolbox::sobol().