Files downloaded from Internet are marked as 'quarantined' by OS X.
 For such files, opening URLs of type file://path#fragment via
 
   Launch Services API
 
 (used internally by 
Desktop.browse(URI)) won't work as expected (fragment will be ignored on file opening).
 This class allows to clear quarantine status from folder containing Javadoc, if confirmed by user.
 Implementation note: UserDefinedFileAttributeView is not supported on macOS (https://bugs.openjdk.java.net/browse/JDK-8030048),
 so the class resorts to JNA.