Rethink cloning of elements for self referencing elements
- current concept does not cover cloning of reused elements
- current concept not sufficient for cyclic reuses
(from redmine: issue id 1144, created on 2018-08-11tgradl, closed on 2018-08-21)
(from redmine: issue id 1144, created on 2018-08-11tgradl, closed on 2018-08-21)