Comments on new_infections() function and compartments_from_susceptible argument

[Degoot-AM]

I have two concern on new_infections()

1. The name compartments_from_susceptible may be misleading, as it suggests a transition rather than an exclusion -similar to the difference between "near miss" and "near hit". The intent is to specify compartments that should be excluded from new infections calculations.

2. Default Exclusion of vaccinated compartment: The function should automatically exclude the vaccinated compartment (if present in the model object) without requiring manual specification in compartments_from_susceptible.