Added: modified flag
Added: transient home population property
Updated
Fixed: to great deltas in calculate
Moved: SolarSystemPopulationManager#simulate -> Calculator
Added: simulate (incl. merge and save) to SolarSystemPopulationManagerImpl
Added: isPresent to SolarSystemPopulation
Updated: made logic use SolarSystemPopulation.isPresent
Fixed some minor bugs still searching for the big one :-/