ess-Importer: convert last known exterior cell
(RM-3693 from redmine: created on 2016-12-24 by Miroslav Remák, , closed on 2016-12-25 by Miroslav Remák)
(RM-3693 from redmine: created on 2016-12-24 by Miroslav Remák, , closed on 2016-12-25 by Miroslav Remák)