#1193 Test test function may not run without a full-fledged Solid in the input parameter (here the Mu_i and C_i aren't provided). For this prototype to work I had to deactivate some code; I will put it back properly and add comments in the next commits. Likewise, currently only Mu_i and C_i are optional; I will mimic that for all relevant Solid parameters.

[WARNING] The models with a Solid involve might not compile!