Y.A.A. (Yet Another Algorithm...)

This new algorithm removes completely remove the mixture approach used since now.

Now, I build the absorption and scattering spectrum "from scratch", using mathematical minimization. The coefficient are previously found, and then used here. No fancy mathematics in C++ then :)

The illuminant profile format has changed, I'm preserving the old format in a separate dir.

To avoid crashes, you should remove your share/apps/krita/illuminants directory before make install.

Enjoy!

PS: Even if you can see some mixing result using the alpha transparency, this is not supposed to work and will *not* work for every color.

To have correct mixtures with this colorspace, you've to wait the painterly paintop.