Function add_activity_constraints 

pub fn add_activity_constraints(
    problem: &mut RowProblem,
    asset: &AssetRef,
    activity_vars: &IndexMap<TimeSliceID, Col>,
    time_slice_info: &TimeSliceInfo,
)

Adds activity constraints to the problem.

Constrains the activity variables to be within the asset’s activity limits.

The asset’s per-capacity activity limits are scaled by the asset’s capacity to give absolute bounds, and a single bounded constraint is added per time-slice selection covering the sum of activity in that selection.