Pam and fixes - Githubissues

This branch generalizes the use of the k-medoids classification algorithm and applies it to:

In addition, iTerm's color manager has been generalized that way, it could be also used by gnome terminal in a future pull request.

The terminal color manager works this way:

It classifies the colors according to their hues into six clusters
for each cluster, it takes a pair (brightest color, color having the median luminosity)
With the twelve colors, it creates a terminal profile by adding default values for the black and white pairs normal/bright

Finally, it solves various bugs and improves the style.

rvdz / hapycolor