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/Data Contracts/ReprintBO.cs

@@ -0,0 +1,13 @@
+using System;
+using Tanshu.Accounts.Entities.Auth;
+
+namespace Tanshu.Accounts.Entities
+{
+    public class Reprint
+    {
+        public virtual int ReprintID { get; set; }
+        public virtual User User { get; set; }
+        public virtual DateTime Date { get; set; }
+        public virtual Voucher Voucher { get; set; }
+    }
+}