Function SCIPgetSepaMinEfficacy 

pub unsafe extern "C" fn SCIPgetSepaMinEfficacy(
    scip: *mut SCIP,
) -> f64

gets value of minimal efficacy for a cut to enter the LP

@pre This method can be called if @p scip is in one of the following stages: - \ref SCIP_STAGE_SOLVING

@return value of “separating/minefficacyroot” if at root node, otherwise value of “separating/minefficacy”