GitLab

Code extracted from:

    https://gitlab.kitware.com/third-party/proj.git

at commit 41bdf05361007f8c5186f3df9944d86bb273ed13 (for/vtk).

This commit cleans up the bar chart update logic, adds support for
using a lookup table to map an array to colors for the bars. It also
adds a test verifying the points, and the bars, using C++, and the
same array/lookup table.

Change-Id: I11585739f5a0c5bca3240274aebafead302e89ec