Multi-objective optimisation

(transfer of old ticket https://forge.irstea.fr/issues/5492)

Now that multi-criteria calculation is available in airGR, it would be great to add the possibility to perform multi-objective calibration (pareto front estimation) in an easy way with airGR. Not sure how we should do (internal function or vignette, additional option of CreateCalibOptions, using another package or not).

Note that I proposed some lines of code with the caRamel package in my review here