Describe the fundamental stock-flow concepts, variations and how our tools implement them.
stkflwstock - the similar process driven by demand
popbirths - animal population process driven by births
populate - animal population process driven by fertility levels
selfstkflw - a stock flow process whose stock depends on its’ own output
stkactflw - evolve a stock by additions and deletions subject to an activity
stkflwage - stkflwstock with entrant and exit age distributions and promotion
stkflwflwy - evolve a stock by year built with flows
stkflwio - evolve a capacity constrained input output system
stkflwstkshr - evolve a multityped vintaged stock to demand
stkflwstky - evolve a stock by year built with conversions