Function price_market_set 

fn price_market_set(
    market_set: &MarketSet,
    model: &Model,
    solution_without_candidates: &Solution<'_>,
    solution_with_candidates: &Solution<'_>,
    year: u32,
    shadow_prices: &PriceMap,
    annual_activities: &mut Option<HashMap<AssetRef, Activity>>,
    market_prices: &mut PriceMap,
    strategy_override: Option<PricingStrategy>,
)

Calculate prices for the markets in an market set, updating market_prices.