Improve color gradients in visualization

when completeness is close to 0, deconvolution may succeed but the color associated would be green (see nov. 10th in http://resif-waveqc-dev.u-ga.fr/stations/101/)
use red -> orange -> yellow -> green ?
use http://colorbrewer2.org ?

Edited Nov 21, 2023 by Simon Panay

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