To-do for version 0.5.0

[privet-kitty]

• Split the test file for each module
• Better dufy/munsell
  • Rewrite fetch-mrd.lisp with dufy/core module instead of dufy
  • Add the test for checking `hue reversal' doesn't occurs.
  • Better lchab-to-mhvc-illum-c
    • Output the inversed Munsell Renotation Data
    • Implement the inter- and extrapolation of this data
    • Use it to get a better initial value in lchab-to-mhvc-illum-c
• Make an extra module containing `all' converters.