Fix for local kioslaves, which don't care for the hostname part of the URL.

KDirModel was getting confused (yeah I know this happens easily) by child items without host, when the parent URL has a host.
BUG 160057

Fix assertion failure due to the code still assuming that all "listers" were using a KIO::ListJob; but some are using a CachedItemsJob and are not concerned by the ListJob being finished.

Fix bug 53397 from 2003: properties dialog didn't show new permissions when reopening it, because KDirLister didn't update the root KFileItem in FileChanged.
BUG 53397