Reprint and Printed bill editing logged.

Printed bill can no longer be changed, any changes voids the bill and prints a new one.
Added option to Split Bill.
Kot printed with right time.
Numerous bug fixes.

Tanshu.Accounts.Contracts/Helper Functions/ReflectionHelper.cs

@@ -0,0 +1,28 @@
+using System.Reflection;
+using Tanshu.Accounts.Entities;
+
+namespace Tanshu.Common.Helpers
+{
+    public enum VoucherFields
+    {
+        CreationDate,
+        LastEditDate,
+        Date,
+        BillID,
+        KotID
+    }
+    public static class ReflectionHelper
+    {
+        public static void SetValue(this Voucher voucher, VoucherFields field, object value)
+        {
+            var fi = typeof(Voucher).GetField(ConvertToCamelCaseUnderscore(field.ToString()), BindingFlags.NonPublic | BindingFlags.Instance);
+            if (fi != null) 
+                fi.SetValue(voucher, value);
+        }
+        private static string ConvertToCamelCaseUnderscore(string propertyName)
+        {
+            return "_" + propertyName[0].ToString().ToLower() + propertyName.Substring(1);
+        }
+
+    }
+}