An interchange law for squares and cleanups to Cubical/PathSquare.v #3895

Job	Run time
opam-build (dev, ubuntu-latest)	4m 11s
opam-build (supported, ubuntu-latest)	4m 41s
quick-build (supported, ubuntu-latest)	3m 27s
quick-build (latest, ubuntu-latest)	3m 22s
opam-build (latest, ubuntu-latest)	4m 29s
nix	2m 12s
build (supported)	3m 49s
quick-build (dev, ubuntu-latest)	3m 52s
build (dev, --warnings)	3m 47s
build (latest)	3m 34s
doc-dep-graphs	8m 1s
doc-coqdoc	1m 51s
doc-alectryon	15m 41s
install (latest)	1m 44s
coqchk (supported)	2m 8s
doc-timing	1m 54s
install (dev)	1m 48s
install (supported)	1m 39s
coqchk (dev)	1m 36s
coqchk (latest)	2m 10s
delete-artifacts	7s
deploy-doc	-1s
	1h 16m 2s

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