added converted si Abs() method

VectoCommon/VectoCommon/Utils/SIConvertExtensionMethods.cs

@@ -30,6 +30,7 @@
 */
 
 using System;
+using System.Diagnostics;
 using System.Globalization;
 
 namespace TUGraz.VectoCommon.Utils
@@ -75,6 +76,12 @@ namespace TUGraz.VectoCommon.Utils
 			}
 		}
 
+		[DebuggerHidden]
+		public ConvertedSI Abs()
+		{
+			return new ConvertedSI(Math.Abs(Value), Units);
+		}
+
 		public static implicit operator double(ConvertedSI self)
 		{
 			return self._value;
@@ -337,6 +344,8 @@ namespace TUGraz.VectoCommon.Utils
 			return new ConvertedSI(m3pm3m.Value() * CubicMeterToLiter * Kilo, "l/m³-km");
 		}
 
+	
+
 		public static Meter ConvertToMeter(this ConvertedSI mm)
 		{
 			if (mm.Units != "mm") {

VectoCommon/VectoCommon/Utils/VectoMath.cs

@@ -161,6 +161,12 @@ namespace TUGraz.VectoCommon.Utils
 		{
 			return si.Abs();
 		}
+		[DebuggerStepThrough]
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static ConvertedSI Abs(ConvertedSI cSi)
+		{
+			return cSi.Abs();
+		}
 
 		/// <summary>
 		/// Returns the minimum of two values.