Define iron loss parameters from a map

The fitting function for defining the iron loss parameters from a map (Excel file inside in which several iron loss curves as a function of the flux density are available for different values of frequency) doesn’t work anymore.

This function worked in the previous version FluxMotor 2023.1.

One workaround consists in using the “Flux Material Identification” tool in Flux for defining the parameters.

(ref.: FXM-16789).