Publishing release 21-0.18-dev
A bug-fix release -- the following issues are closed (some did not need code changes)
#903
#902
#895
#894
#888
#876
#860
#780
#777
#776
#766
#756
#747
#746
#738
#725
#724
#719
#617
#616
#547
#546
#449