Moved time-variable parts of powerplant (investment, fixedOperatingCost,
efficiency) into PowerGeneratingTechnology and turned it into TimeSeries
objects. Updated scenario files.
Added EnergyProducer specific investmentRoles. Removed getReps() method
and replaced it with simple reps. calls.
Agent-specific investment roles:
Updated test classes and scenario files
Merge branch 'feature/agentSpecificInvestment' into develop