more on commutator subgroups #3347

Job	Run time
nix	2m 18s
quick-build (supported, ubuntu-latest)	3m 14s
build (supported)	3m 37s
opam-build (supported, ubuntu-latest)	4m 30s
quick-build (latest, ubuntu-latest)	3m 24s
build (latest)	3m 18s
opam-build (latest, ubuntu-latest)	4m 34s
quick-build (dev, ubuntu-latest)	3m 8s
build (dev, --warnings)	3m 27s
opam-build (dev, ubuntu-latest)	4m 11s
doc-coqdoc	1m 33s
doc-alectryon	15m 9s
doc-dep-graphs	7m 35s
coqchk (supported)	2m 5s
doc-timing	1m 36s
coqchk (latest)	1m 53s
install (supported)	1m 30s
coqchk (dev)	1m 43s
install (latest)	1m 31s
install (dev)	1m 41s
deploy-doc	0s
delete-artifacts	10s
	1h 12m 7s

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