Separate the FlexibleSUSY model name from the SARAH model name.
This avoids conflicts in case the user wants to setup separate
FlexibleSUSY model, which use the same SARAH model file.
The name of the FlexibleSUSY model can be set in the model file via

   FSModelName = "MyModel"

If this variable is not set explicitely, it will be set internally
to the name of the SARAH model file.