Show entries of ftp:
KFileWizard: prevent from refreshing on a drive list
KFileWizard: prevent from deleting a root directory
KFileWizard: prevent from copying to a ftp list
KFileWizard: no need to wait for populating a drive list
DirTreeView: prevent from dropping into a ftp list
EntryTreeView: prevent from dropping into a ftp list

and some cleanup