Bugfix release.
Bug fixes
- Previously, census events added a new census node to every distinct ancestral
segment, even when several of these segments were within the same lineage.
With this change, census events now assign a new census node to each
distinct lineage. This will in general reduce the number of census nodes,
and result in census nodes with more than one distinct segment (which
previously did not happen). (#2541 ,@petrelharp)