[CREATE] flat fill swatches generation lib

[Alexandre Prokoudine]

Hi,

FYI: http://ahote.sourceforge.net

"A'Hote is a C++ library for creating color schemes including
complements, split complements, triadics, tetradics, analogous colors,
monochromatic groups, shaded groups, and tinted groups. The color
scheme generators are also overloaded, allowing schemes of schemes to
be generated. There are functions for converting RGB, HSB, HSL, YUV,
and RYB."

Color functions of A'Hote have been merged to Papyrus canvas lib.

Alexandre