DataSourceHandle :: OpenDictionary - Open DictionaryHandle

The DictionaryHandle is opened only when a dictionary path has been defined (dict_path). If another dictionary has already been opened it is closed (CloseDictionary()) before reopening the DictionaryHandle. The DictionaryHandle is opened with the access mode passed to the function. When no database path (db_path) is defined and no access mode is passed the DictionaryHandle is opened with the access mode defined for the database,