Surpressing warnings about predicted rates

		//estimate it using finite difference

		//note that if the finite difference is too small we may get, because of numerical errors, 0

		//todo uses global MINTIMESTEP which might be very small.

		//todo, probably we should implement rate and state versions of all SimulaDerivative classes,

		// so they can simply be called? This might also work better with unit expectations and simulaVariable?

		// this here is for example used to estimate nutrient uptake in nitrate basic

		Time d1 = MINTIMESTEP / 2.;

		Time t1 = t - d1;

		if (t1 < startTime)

		if (t1 < startTime){

			t1 = startTime;

		Time t2 = t1 + 2 * d1;

			get(t1, var);

			var*=0.01;//pure guess

			return;

		}

		Time t2 = t;//t1 + 2 * d1;

		Time rt = SimulaTimeDriven::getWallTime(t2);

		if (t2 > rt) {

			if (rt > t1) {