POLYMAT - poor quality of fitting for multi-mode viscoelastic model, when the only available "ratio" is initialised to zero

Identification of the parameters for a multi-mode viscoelastic model (e.g. Giesekus): the fitting procedure produces properties that are not as good as expected.
By default in versions 3.10.0 and 3.10.2 of POLYFLOW, the only available parameter "ratio" is initialised to zero, which hinders the detection of the sensitivity of the properties with respect to this parameter. When selecting an initial value of 0.5, the resulting fit appears better.
In version 3.10.4 and beyond, this parameter has been purposely initialised to a non-zero value, in order to better identify the sensitivity of the fitting.

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