KCoreDirLister: un-overload canceled() and completed() signals
Deprecate canceled(const QUrl &) and introduce listingDirCanceled(const QUrl &).
Deprecate completed(const QUrl &) and introduce listingDirCompleted(const QUrl &).
Deprecate canceled(const QUrl &) and introduce listingDirCanceled(const QUrl &).
Deprecate completed(const QUrl &) and introduce listingDirCompleted(const QUrl &).