replaced some pointers to mutables, some first thoughts about cursors

src/storage.cpp

@@ -42,6 +42,14 @@ LMDBAL::iStorage::iStorage(const std::string& p_name, Base* parent):
  */
 LMDBAL::iStorage::~iStorage() {}
 
+/**
+ * \brief A private virtual function I need to close each storage in the database
+ */
+void LMDBAL::iStorage::close() {
+    mdb_dbi_close(db->environment, dbi);
+}
+
+
 /**
  * \brief Drops content of a storage interface
  *