R/generate_fctcall.R
    generate_fctcall.RdThis function takes a modelsettings structure and uses that information to create an unevaluated function call that runs the simulator function with the specified settings
generate_fctcall(modelsettings)a list with model settings. Required list elements are: 
List elements with names and values for all inputs expected by simulation function. 
modelsettings$simfunction - name of simulation function in variable  
A string containing an unevaluated function call with the specified settings, or an error message
This function produces a function call for specific settings.