added core functions

-added to data sheet hourly arrivals
-Added rate tables for patient arrivals by ambulance and walk Ins
-added work schedules for doctors and nurses
Added labels, triage categories

-Added Labels and graphs showing utilisation of resources and Patient
Time in System
-Added Triage Categories as a discrete distribution on the patient
sources
-Added multiple symbols showing the triage category on patients via
colour
-Added tallies for each triage category, records time in system per
category
-Added Assumptions label