Updated NH, Code Refactoring, made all DB transactions atomic.

Must use the Repositories with Using or else bad things will happen.

Tanshu.Accounts.Contracts/Data Contracts/ProductGroupBO.cs

@@ -17,6 +17,9 @@ namespace Tanshu.Accounts.Entities
 
         public virtual decimal DiscountLimit { get; set; }
         public virtual bool IsModifierCompulsory { get; set; }
+        public virtual bool Discontinued { get; set; }
+        public virtual int SortOrder { get; set; }
+
         public virtual string GroupType { get; set; }
         [Inverse]
         public virtual IList<Product> Products { get; set; }