An interchange law for squares and cleanups to Cubical/PathSquare.v #3887

Job	Run time
opam-build (latest, ubuntu-latest)	4m 36s
opam-build (dev, ubuntu-latest)	4m 16s
quick-build (supported, ubuntu-latest)	3m 49s
quick-build (dev, ubuntu-latest)	3m 10s
nix	2m 24s
build (dev, --warnings)	3m 45s
quick-build (latest, ubuntu-latest)	3m 40s
build (latest)	3m 33s
opam-build (supported, ubuntu-latest)	4m 33s
build (supported)	3m 45s
doc-dep-graphs	7m 54s
doc-alectryon	15m 31s
doc-timing	1m 34s
doc-coqdoc	2m 5s
coqchk (latest)	2m 12s
coqchk (dev)	1m 45s
coqchk (supported)	2m 1s
install (latest)	1m 48s
install (supported)	1m 50s
install (dev)	2m 2s
delete-artifacts	12s
deploy-doc	0s
	1h 16m 25s

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