. Finished camera database 3D grid construction
. Factorized color swatches generation
. Color swatches can now average the colors within a picked rectangle
. Verified database buildup & calibration
. Added a "white reflectance reference" management in the database
 => some kind of "white balance" for reflectances where the user can pick the luminance of the 99% probe in the image to account for lighting conditions in an image, without having to recompute the entire camera calibration files
. Clean up