[Opc_trunk] Implemented #156 and #157
[Opc_trunk] Modified documentation for Opc_Translate_Adapter_Yaml and Opc_Translate_Adapter_Xml in order to be consistent with updated versions.
[Opc_trunk] Slightly modified exceptions and Opc_View_Cache (modified to be more consistent with other classes [directory in place of cacheDir])
[Opc_trunk] Added loading default configuration from Opc_Class to all Opc_Translate_Adapter's