1) removed unknownWordBootstrappingGetUnknownWord(). 2) Fixed a bug in part 1 of UnknownWordBootstrappingMain().
1) added/updated methods updateWordPOS() and removeWordPOS() in DataHolder. 2) eidted the code in DataHolder so that no direct updates on WordPOSTable any more. Instead, all updates on WordPOSTable now are done by updateWordPOS()/RemoveWordPOS().