Adding methods to calculate various metrics

[sourabhdalvi]

We want to add metric that will be useful for post processing analysis

• storage cycles
• integration factors
• capacity factors
• capacity value
• dropped load hours/MW
• cost breakdown (production, startup etc..)
• curtailment %
• aggregate generation
• possibly including runtime/memory usage stats
• automate identification of peak curtailment, peak load, peak VRE production days for plotting
• results summary table with all of the above