[SE-47]

remove: - 'DirectoryScanningChangeListener', 'PathHandlerInterceptor', 'StoreHandlerInterceptor'.
- 'IStoreHandler.mayHandle' and 'IPathHandler.mayHandle' methods.
add: - 'IDirectoryScanningHandler', 'FaultyPathHandler', 'DirectoryScanningHandlerInterceptor' and 'HighwaterMarkDirectoryScanningHandler'.
change: - DirectoryScanningTimerTask goes into a sleeping mode when high water mark is reached. It does not even write down the faulty path.

SVN: 6273