Merge branch 'v0.13_adaptations_for_refs_for_helical' into '0.13'

adaptations which alow to use the exact same workflow for multi-z...

See merge request !190 (merged)

(cherry picked from commit 9c594cbf)

16e1cc05 adaptations which alow to use the exact same workflow for multi-z... e62812d1 black f2ceec2b Merge branch '0.13' into v0.13_adaptations_for_refs_for_helical 8cbeafbc tested 42f8d0e5 resolved some mess with multiple branches changing the same file e77f573c Merge branch '0.13' into v0.13_adaptations_for_refs_for_helical 33fb3c64 testing it 03bcce85 zstages2nxs: clarify a condition