use static method to get vecto version

VectoCore/VectoCore/Utils/VectoCSVFile.cs

@@ -199,8 +199,8 @@ namespace TUGraz.VectoCore.Utils
 			}
 			if (addVersionHeader) {
 				try {
-					var vectodll = Assembly.LoadFrom(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "VectoCore.dll")).GetName();
-					writer.WriteLine("# VECTO {0} - {1}", vectodll.Version, DateTime.Now.ToString("dd.MM.yyyy HH:mm"));
+					writer.WriteLine("# VECTO {0} - {1}", VectoSimulationCore.VersionNumber,
+						DateTime.Now.ToString("dd.MM.yyyy HH:mm"));
 				} catch (Exception) {
 					writer.WriteLine("# VECTO {0} - {1}", "Unknown", DateTime.Now.ToString("dd.MM.yyyy HH:mm"));
 				}
@@ -234,4 +234,4 @@ namespace TUGraz.VectoCore.Utils
 			}
 		}
 	}
-}
\ No newline at end of file
+}