Make simulation reversible by adding a back button feature.
(from redmine: issue id 2796, created on 2017-01-20, closed on 2017-12-21)
- Relations:
- relates #3222 (closed)
- duplicates #2131 (closed)
(from redmine: issue id 2796, created on 2017-01-20, closed on 2017-12-21)