And apparently has for some time[1]. Thanks to Will Gray (graywh) for pointing this out to me. [1] http://websvn.kde.org/?revision=909719&view=revision)
Not useful to keep it in one file anymore, since we already rely upon multiple, and this will make later extending easier by giving us some library functions for approximators.
Only using showrgb would fail on systems that have 256 colors terminals but don't have xorg, such as OS X.