adding new column to the modal output data: simulation interval [s]

VectoCore/Models/Simulation/Data/ModalResult.cs

@@ -58,10 +58,17 @@ namespace TUGraz.VectoCore.Models.Simulation.Data
     {
         /// <summary>
         /// Time step [s].
+        /// Midpoint of the simulated interval.
         /// </summary>
         [ModalResultField(typeof(double), caption: "time [s]")]
         time,
 
+		/// <summary>
+		/// Simulation interval around the current time step. [s]
+		/// </summary>
+		[ModalResultField(typeof(double), caption: "simulation_interval [s]")]
+		simulationInterval,
+
         /// <summary>
         /// Engine speed [1/min].
         /// </summary>