Add individual attributes upstream in the pipeline

[Hussein-Mahfouz]

I think more individual attributes make the output useful for different purposes. In my use case, I have needed (and added) the following: isStudent, hasPTsubscription, isPassenger, sex, CarAvailability, BicycleAvailability, hasLicence. See #77

I am currently implementing this in scripts/5_acbm_to_matsim_xml.py which is the last part of the pipeline. It would be useful to:

• migrate this upstream. That way the individuals.csv output from scripts/3.3_assign_facility_all.py could have more individual data and would be useful for non matsim usecases. Alternatively we can update the individuals.csv in scripts/5_acbm_to_matsim_xml.py and overwrite it
• Add a config argument for the user to specify what additional columns from the NTS they want in the final output. I think these should just be variable from the individuals and households nts data

Perhaps this is something that could be implemented in the cols_for_assignment() logic, or a similar implementation