Transactions now get closed with the database

src/transaction.h

@@ -39,6 +39,7 @@ public:
 
 protected:
     Transaction(TransactionID txn, const Base* parent);
+    void reset();
 
 protected:
     TransactionID txn;          /**<\brief Transaction inner handler*/
@@ -53,6 +54,7 @@ public:
     explicit WriteTransaction(WriteTransaction&& other);
     WriteTransaction(const WriteTransaction& other) = delete;
     WriteTransaction& operator = (const WriteTransaction& other) = delete;
+    WriteTransaction& operator = (WriteTransaction&& other);
 
     void commit();
     void abort();